Cod egg

from opendrift.readers import reader_netCDF_CF_generic
from opendrift.models.pelagicegg import PelagicEggDrift
from datetime import datetime, timedelta

o = PelagicEggDrift(loglevel=20)  # Set loglevel to 0 for debug information

# Forcing with Topaz ocean model and MEPS atmospheric model
o.add_readers_from_list([
    'https://thredds.met.no/thredds/dodsC/cmems/topaz6/dataset-topaz6-arc-15min-3km-be.ncml',
    'https://thredds.met.no/thredds/dodsC/mepslatest/meps_lagged_6_h_latest_2_5km_latest.nc'])
14:08:25 INFO    opendrift.models.basemodel:539: OpenDriftSimulation initialised (version 1.10.7 / v1.10.6-119-g1da5bec)

spawn NEA cod eggs at defined position and time

time = datetime.utcnow()
o.seed_elements(14. , 68.1, z=-40, radius=2000, number=500,
                time=time, diameter=0.0014, neutral_buoyancy_salinity=31.25)
o.seed_elements(12.5, 68., z=-40, radius=2000, number=500,
                time=time, diameter=0.0014, neutral_buoyancy_salinity=31.25)
o.seed_elements(13.5, 68., z=-40, radius=2000, number=500,
                time=time, diameter=0.0014, neutral_buoyancy_salinity=31.25)
o.seed_elements(13., 67.8, z=-40, radius=2000, number=500,
                time=time, diameter=0.0014, neutral_buoyancy_salinity=31.25)

Adjusting some configuration

o.set_config('drift:vertical_mixing', True)
o.set_config('vertical_mixing:diffusivitymodel', 'windspeed_Sundby1983') # windspeed parameterization for eddy diffusivity

Vertical mixing requires fast time step

o.set_config('vertical_mixing:timestep', 60.) # seconds

Running model

o.run(duration=timedelta(hours=48), time_step=3600)
14:08:25 INFO    opendrift.models.basemodel:2591: Fallback values will be used for the following variables which have no readers:
14:08:25 INFO    opendrift.models.basemodel:2594:       x_sea_water_velocity: 0.000000
14:08:25 INFO    opendrift.models.basemodel:2594:       y_sea_water_velocity: 0.000000
14:08:25 INFO    opendrift.models.basemodel:2594:       sea_surface_wave_significant_height: 0.000000
14:08:25 INFO    opendrift.models.basemodel:2594:       sea_ice_area_fraction: 0.000000
14:08:25 INFO    opendrift.models.basemodel:2594:       x_wind: 0.000000
14:08:25 INFO    opendrift.models.basemodel:2594:       y_wind: 0.000000
14:08:25 INFO    opendrift.models.basemodel:2594:       sea_floor_depth_below_sea_level: 100.000000
14:08:25 INFO    opendrift.models.basemodel:2594:       ocean_vertical_diffusivity: 0.020000
14:08:25 INFO    opendrift.models.basemodel:2594:       ocean_mixed_layer_thickness: 50.000000
14:08:25 INFO    opendrift.models.basemodel:2594:       sea_water_temperature: 10.000000
14:08:25 INFO    opendrift.models.basemodel:2594:       sea_water_salinity: 34.000000
14:08:25 INFO    opendrift.models.basemodel:2594:       surface_downward_x_stress: 0.000000
14:08:25 INFO    opendrift.models.basemodel:2594:       surface_downward_y_stress: 0.000000
14:08:25 INFO    opendrift.models.basemodel:2594:       turbulent_kinetic_energy: 0.000000
14:08:25 INFO    opendrift.models.basemodel:2594:       turbulent_generic_length_scale: 0.000000
14:08:25 INFO    opendrift.models.basemodel:2594:       upward_sea_water_velocity: 0.000000
14:08:25 INFO    opendrift.models.basemodel:2753: Adding a dynamical landmask with max. priority based on assumed maximum speed of 1 m/s. Adding a customised landmask may be faster...
14:08:31 INFO    opendrift.models.basemodel:1701: Using existing reader for land_binary_mask
14:08:31 INFO    opendrift.models.basemodel:1713: All points are in ocean
14:08:31 INFO    opendrift.models.basemodel:2882: 2023-09-01 14:08:25.479338 - step 1 of 48 - 2000 active elements (0 deactivated)
14:08:32 INFO    opendrift.readers.reader_netCDF_CF_generic:92: Opening dataset: https://thredds.met.no/thredds/dodsC/cmems/topaz6/dataset-topaz6-arc-15min-3km-be.ncml
/opt/conda/envs/opendrift/lib/python3.11/site-packages/pyproj/crs/crs.py:1286: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordinate-reference-systems
  proj = self._crs.to_proj4(version=version)
14:08:38 INFO    opendrift.readers.reader_netCDF_CF_generic:92: Opening dataset: https://thredds.met.no/thredds/dodsC/mepslatest/meps_lagged_6_h_latest_2_5km_latest.nc
/opt/conda/envs/opendrift/lib/python3.11/site-packages/pyproj/crs/crs.py:1286: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordinate-reference-systems
  proj = self._crs.to_proj4(version=version)
14:08:41 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:41 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:41 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:41 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:42 INFO    opendrift.models.basemodel:2882: 2023-09-01 15:08:25.479338 - step 2 of 48 - 2000 active elements (0 deactivated)
14:08:44 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:44 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:44 INFO    opendrift.models.basemodel:2882: 2023-09-01 16:08:25.479338 - step 3 of 48 - 2000 active elements (0 deactivated)
14:08:45 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:45 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:46 INFO    opendrift.models.basemodel:2882: 2023-09-01 17:08:25.479338 - step 4 of 48 - 2000 active elements (0 deactivated)
14:08:47 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:47 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:47 INFO    opendrift.models.basemodel:2882: 2023-09-01 18:08:25.479338 - step 5 of 48 - 2000 active elements (0 deactivated)
14:08:49 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:49 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:49 INFO    opendrift.models.basemodel:2882: 2023-09-01 19:08:25.479338 - step 6 of 48 - 2000 active elements (0 deactivated)
14:08:51 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:51 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:51 INFO    opendrift.models.basemodel:2882: 2023-09-01 20:08:25.479338 - step 7 of 48 - 2000 active elements (0 deactivated)
14:08:53 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:53 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:53 INFO    opendrift.models.basemodel:2882: 2023-09-01 21:08:25.479338 - step 8 of 48 - 2000 active elements (0 deactivated)
14:08:55 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:55 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:55 INFO    opendrift.models.basemodel:2882: 2023-09-01 22:08:25.479338 - step 9 of 48 - 2000 active elements (0 deactivated)
14:08:57 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:57 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:58 INFO    opendrift.models.basemodel:2882: 2023-09-01 23:08:25.479338 - step 10 of 48 - 2000 active elements (0 deactivated)
14:08:59 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:59 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:08:59 INFO    opendrift.models.basemodel:2882: 2023-09-02 00:08:25.479338 - step 11 of 48 - 2000 active elements (0 deactivated)
14:09:01 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:01 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:01 INFO    opendrift.models.basemodel:2882: 2023-09-02 01:08:25.479338 - step 12 of 48 - 2000 active elements (0 deactivated)
14:09:03 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:03 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:03 INFO    opendrift.models.basemodel:2882: 2023-09-02 02:08:25.479338 - step 13 of 48 - 2000 active elements (0 deactivated)
14:09:05 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:05 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:05 INFO    opendrift.models.basemodel:2882: 2023-09-02 03:08:25.479338 - step 14 of 48 - 2000 active elements (0 deactivated)
14:09:07 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:07 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:07 INFO    opendrift.models.basemodel:2882: 2023-09-02 04:08:25.479338 - step 15 of 48 - 2000 active elements (0 deactivated)
14:09:09 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:09 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:09 INFO    opendrift.models.basemodel:2882: 2023-09-02 05:08:25.479338 - step 16 of 48 - 2000 active elements (0 deactivated)
14:09:11 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:11 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:12 INFO    opendrift.models.basemodel:2882: 2023-09-02 06:08:25.479338 - step 17 of 48 - 2000 active elements (0 deactivated)
14:09:13 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:13 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:14 INFO    opendrift.models.basemodel:2882: 2023-09-02 07:08:25.479338 - step 18 of 48 - 2000 active elements (0 deactivated)
14:09:15 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:15 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:16 INFO    opendrift.models.basemodel:2882: 2023-09-02 08:08:25.479338 - step 19 of 48 - 2000 active elements (0 deactivated)
14:09:17 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:17 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:18 INFO    opendrift.models.basemodel:2882: 2023-09-02 09:08:25.479338 - step 20 of 48 - 2000 active elements (0 deactivated)
14:09:20 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:20 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:20 INFO    opendrift.models.basemodel:2882: 2023-09-02 10:08:25.479338 - step 21 of 48 - 2000 active elements (0 deactivated)
14:09:22 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:22 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:22 INFO    opendrift.models.basemodel:2882: 2023-09-02 11:08:25.479338 - step 22 of 48 - 2000 active elements (0 deactivated)
14:09:23 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:23 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:24 INFO    opendrift.models.basemodel:2882: 2023-09-02 12:08:25.479338 - step 23 of 48 - 2000 active elements (0 deactivated)
14:09:25 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:25 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:25 INFO    opendrift.models.basemodel:2882: 2023-09-02 13:08:25.479338 - step 24 of 48 - 2000 active elements (0 deactivated)
14:09:27 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:27 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:27 INFO    opendrift.models.basemodel:2882: 2023-09-02 14:08:25.479338 - step 25 of 48 - 2000 active elements (0 deactivated)
14:09:29 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:29 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:29 INFO    opendrift.models.basemodel:2882: 2023-09-02 15:08:25.479338 - step 26 of 48 - 2000 active elements (0 deactivated)
14:09:31 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:31 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:31 INFO    opendrift.models.basemodel:2882: 2023-09-02 16:08:25.479338 - step 27 of 48 - 2000 active elements (0 deactivated)
14:09:33 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:33 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:33 INFO    opendrift.models.basemodel:2882: 2023-09-02 17:08:25.479338 - step 28 of 48 - 2000 active elements (0 deactivated)
14:09:35 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:35 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:35 INFO    opendrift.models.basemodel:2882: 2023-09-02 18:08:25.479338 - step 29 of 48 - 2000 active elements (0 deactivated)
14:09:37 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:37 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:37 INFO    opendrift.models.basemodel:2882: 2023-09-02 19:08:25.479338 - step 30 of 48 - 2000 active elements (0 deactivated)
14:09:39 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:39 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:39 INFO    opendrift.models.basemodel:2882: 2023-09-02 20:08:25.479338 - step 31 of 48 - 2000 active elements (0 deactivated)
14:09:41 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:41 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:41 INFO    opendrift.models.basemodel:2882: 2023-09-02 21:08:25.479338 - step 32 of 48 - 2000 active elements (0 deactivated)
14:09:43 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:43 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:43 INFO    opendrift.models.basemodel:2882: 2023-09-02 22:08:25.479338 - step 33 of 48 - 2000 active elements (0 deactivated)
/root/project/opendrift/readers/interpolation/interpolators.py:17: RuntimeWarning: overflow encountered in cast
  data[mask] = np.finfo(np.float64).min
14:09:45 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:45 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:45 INFO    opendrift.models.basemodel:2882: 2023-09-02 23:08:25.479338 - step 34 of 48 - 2000 active elements (0 deactivated)
14:09:47 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:47 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:47 INFO    opendrift.models.basemodel:2882: 2023-09-03 00:08:25.479338 - step 35 of 48 - 2000 active elements (0 deactivated)
14:09:49 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:49 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:49 INFO    opendrift.models.basemodel:2882: 2023-09-03 01:08:25.479338 - step 36 of 48 - 2000 active elements (0 deactivated)
14:09:50 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:50 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:51 INFO    opendrift.models.basemodel:2882: 2023-09-03 02:08:25.479338 - step 37 of 48 - 2000 active elements (0 deactivated)
14:09:54 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:54 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:54 INFO    opendrift.models.basemodel:2882: 2023-09-03 03:08:25.479338 - step 38 of 48 - 2000 active elements (0 deactivated)
14:09:55 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:55 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:55 INFO    opendrift.models.basemodel:2882: 2023-09-03 04:08:25.479338 - step 39 of 48 - 2000 active elements (0 deactivated)
14:09:58 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:58 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:58 INFO    opendrift.models.basemodel:2882: 2023-09-03 05:08:25.479338 - step 40 of 48 - 2000 active elements (0 deactivated)
14:09:59 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:59 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:09:59 INFO    opendrift.models.basemodel:2882: 2023-09-03 06:08:25.479338 - step 41 of 48 - 2000 active elements (0 deactivated)
14:10:00 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:10:00 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:10:01 INFO    opendrift.models.basemodel:2882: 2023-09-03 07:08:25.479338 - step 42 of 48 - 2000 active elements (0 deactivated)
14:10:02 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:10:02 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:10:02 INFO    opendrift.models.basemodel:2882: 2023-09-03 08:08:25.479338 - step 43 of 48 - 2000 active elements (0 deactivated)
14:10:03 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:10:03 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:10:03 INFO    opendrift.models.basemodel:2882: 2023-09-03 09:08:25.479338 - step 44 of 48 - 2000 active elements (0 deactivated)
14:10:05 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:10:05 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:10:05 INFO    opendrift.models.basemodel:2882: 2023-09-03 10:08:25.479338 - step 45 of 48 - 2000 active elements (0 deactivated)
14:10:07 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:10:07 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:10:07 INFO    opendrift.models.basemodel:2882: 2023-09-03 11:08:25.479338 - step 46 of 48 - 2000 active elements (0 deactivated)
14:10:08 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:10:08 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:10:09 INFO    opendrift.models.basemodel:2882: 2023-09-03 12:08:25.479338 - step 47 of 48 - 2000 active elements (0 deactivated)
14:10:10 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:10:10 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:10:10 INFO    opendrift.models.basemodel:2882: 2023-09-03 13:08:25.479338 - step 48 of 48 - 2000 active elements (0 deactivated)
14:10:13 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor
14:10:13 WARNING opendrift.readers.interpolation.structured:46: Ensemble data currently not extrapolated towards seafloor

Print and plot results. At the end the wind vanishes, and eggs come to surface

print(o)

o.plot(fast=True)
o.animation(fast=True, color='z')
OpenDrift - PelagicEggDrift 2023-09-01 14:08 to 2023-09-03 14:08 UTC (49 steps)
===========================
--------------------
Reader performance:
--------------------
global_landmask
 0:00:00.0  total
 0:00:00.0  preparing
 0:00:00.0  reading
 0:00:00.0  masking
--------------------
https://thredds.met.no/thredds/dodsC/cmems/topaz6/dataset-topaz6-arc-15min-3km-be.ncml
 0:00:45.8  total
 0:00:00.0  preparing
 0:00:45.6  reading
 0:00:00.0  interpolation
 0:00:00.0  interpolation_time
 0:00:00.2  rotating vectors
 0:00:00.0  masking
--------------------
https://thredds.met.no/thredds/dodsC/mepslatest/meps_lagged_6_h_latest_2_5km_latest.nc
 0:00:43.8  total
 0:00:00.0  preparing
 0:00:43.3  reading
 0:00:00.8  interpolation
 0:00:00.0  interpolation_time
 0:00:00.4  rotating vectors
 0:00:00.0  masking
--------------------
Performance:
 1:48.1 total time
    0.0 configuration
    6.2 preparing main loop
      6.1 making dynamical landmask
      0.0 moving elements to ocean
   1:37.6 readers
        0.0 global_landmask
        0.2 postprocessing
 1:41.7 main loop
       45.9 https://thredds.met.no/thredds/dodsC/cmems/topaz6/dataset-topaz6-arc-15min-3km-be.ncml
       43.8 https://thredds.met.no/thredds/dodsC/mepslatest/meps_lagged_6_h_latest_2_5km_latest.nc
      3.4 updating elements
        3.3 vertical mixing
    0.0 cleaning up
--------------------
===========================
Model:  PelagicEggDrift     (OpenDrift version 1.10.7)
        2000 active PelagicEgg particles  (0 deactivated, 0 scheduled)
-------------------
Environment variables:
  -----
  land_binary_mask
     1) global_landmask
  -----
  sea_floor_depth_below_sea_level
  x_sea_water_velocity
  y_sea_water_velocity
     1) https://thredds.met.no/thredds/dodsC/cmems/topaz6/dataset-topaz6-arc-15min-3km-be.ncml
  -----
  x_wind
  y_wind
     1) https://thredds.met.no/thredds/dodsC/mepslatest/meps_lagged_6_h_latest_2_5km_latest.nc
  -----
Readers not added for the following variables:
  ocean_mixed_layer_thickness
  ocean_vertical_diffusivity
  sea_ice_area_fraction
  sea_surface_wave_significant_height
  sea_water_salinity
  sea_water_temperature
  surface_downward_x_stress
  surface_downward_y_stress
  turbulent_generic_length_scale
  turbulent_kinetic_energy
  upward_sea_water_velocity

Time:
        Start: 2023-09-01 14:08:25.479338 UTC
        Present: 2023-09-03 14:08:25.479338 UTC
        Calculation steps: 48 * 1:00:00 - total time: 2 days, 0:00:00
        Output steps: 49 * 1:00:00
===========================

14:10:13 WARNING opendrift.models.basemodel:3226: Plotting fast. This will make your plots less accurate.
0.158576945415655 ALPHA
14:10:20 WARNING opendrift.models.basemodel:3226: Plotting fast. This will make your plots less accurate.
14:10:22 INFO    opendrift.models.basemodel:5350: Saving animation to /root/project/docs/source/gallery/animations/example_codegg_0.gif...
14:10:33 INFO    opendrift.models.basemodel:3848: Time to make animation: 0:00:12.494039
../_images/example_codegg_0.gif
o.animate_vertical_distribution()
14:10:35 INFO    opendrift.models.basemodel:5350: Saving animation to /root/project/docs/source/gallery/animations/example_codegg_1.gif...
14:10:49 INFO    opendrift.models.oceandrift:686: Time to make animation: 0:00:14.236935
../_images/example_codegg_1.gif

Total running time of the script: (2 minutes 23.690 seconds)

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