{
  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\n# Mixing down to Mixed Layer Depth\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "from datetime import datetime, timedelta\nfrom opendrift.models.oceandrift import OceanDrift\nfrom opendrift.readers.reader_constant import Reader as ConstantReader"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Mixed Layer Depth of 20m West of 3 deg E, and 50m to the east\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "r1 = ConstantReader({'ocean_mixed_layer_thickness': 20})\nr2 = ConstantReader({'ocean_mixed_layer_thickness': 50})\nr1.xmax = 3\nr2.xmin = 3"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "First with Sundby1983 parameterization of diffusivity, based on wind and MLD\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "o = OceanDrift(loglevel=50)\no.add_reader([r1, r2])\no.set_config('environment:constant:y_wind', 8)  # Some wind for mixing\no.set_config('drift:vertical_mixing', True)\no.set_config('vertical_mixing:diffusivitymodel', 'windspeed_Sundby1983')\n# Increasing background diffusivity beyond default (1.2e-5) to avoid artefact due to sharp gradient at MLD\no.set_config('vertical_mixing:background_diffusivity', 0.001)\no.seed_cone(lon=[2, 4], lat=[60, 60], time=datetime.now(), number=5000)\no.run(duration=timedelta(hours=48))\no.animation_profile()"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "<img src=\"file://gallery/animations/example_mixed_layer_depth_0.gif\">\n\n"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Same, but with Large1994 parameterization of diffusivity\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "o = OceanDrift(loglevel=50)\no.add_reader([r1, r2])\no.set_config('environment:constant:y_wind', 8)  # Some wind for mixing\no.set_config('drift:vertical_mixing', True)\no.set_config('vertical_mixing:diffusivitymodel', 'windspeed_Large1994')\no.set_config('vertical_mixing:background_diffusivity', 0.001)\no.seed_cone(lon=[2, 4], lat=[60, 60], time=datetime.now(), number=5000)\no.run(duration=timedelta(hours=48))\no.animation_profile()"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "<img src=\"file://gallery/animations/example_mixed_layer_depth_1.gif\">\n\n"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Using Large1994, but with 0 diffusivity below MLD\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "o = OceanDrift(loglevel=50)\no.add_reader([r1, r2])\no.set_config('environment:constant:y_wind', 8)  # Some wind for mixing\no.set_config('drift:vertical_mixing', True)\no.set_config('vertical_mixing:diffusivitymodel', 'windspeed_Large1994')\no.set_config('vertical_mixing:background_diffusivity', 0)\no.seed_cone(lon=[2, 4], lat=[60, 60], time=datetime.now(), number=5000)\no.run(duration=timedelta(hours=48))\no.animation_profile()"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "<img src=\"file://gallery/animations/example_mixed_layer_depth_2.gif\">\n\n"
      ]
    }
  ],
  "metadata": {
    "kernelspec": {
      "display_name": "Python 3",
      "language": "python",
      "name": "python3"
    },
    "language_info": {
      "codemirror_mode": {
        "name": "ipython",
        "version": 3
      },
      "file_extension": ".py",
      "mimetype": "text/x-python",
      "name": "python",
      "nbconvert_exporter": "python",
      "pygments_lexer": "ipython3",
      "version": "3.11.6"
    }
  },
  "nbformat": 4,
  "nbformat_minor": 0
}