{ "cells": [ { "cell_type": "markdown", "id": "11e55dc7-dee9-45f7-9ae1-ed695ace63f2", "metadata": {}, "source": [ "# _tobac_ example: global MCS tracking in ICON NextGEMS simulation\n", "\n", "In this example, we will explore tracking of mesoscale convective systems (MCSs) in global, km-scale ICON simulations. This example will consist of the following sections:\n", "\n", " 1. Accessing model data remotely, visualisation\n", " 2. Conversion of healpix grid data to a regular lat/lon grid for tracking\n", " 3. Feature detection, tracking, segmentation and calculation of merges and splits on a large domain with periodic boundaries\n", " 4. Conversion of segmentation mask back to healpix grid\n", " 5. Filtering and analysis of detected storms\n", "\n", "The tracking of MCSs in this example follows the MCS tracking model intercomparison (MCSMIP) protocol - https://mcsmip.github.io/ - and is based on the _tobac_ process chain for DYAMOND phase 1/2 model data (https://github.com/w-k-jones/tobac-mcsmip)" ] }, { "cell_type": "code", "execution_count": 1, "id": "82aab32c-002c-45e5-bbdb-04f6b8132b18", "metadata": { "ExecuteTime": { "end_time": "2025-12-21T04:02:35.926155Z", "start_time": "2025-12-21T04:02:33.331339Z" }, "execution": { "iopub.execute_input": "2026-02-02T20:31:08.317870Z", "iopub.status.busy": "2026-02-02T20:31:08.317605Z", "iopub.status.idle": "2026-02-02T20:31:10.823791Z", "shell.execute_reply": "2026-02-02T20:31:10.823238Z" } }, "outputs": [], "source": [ "from datetime import datetime, timedelta\n", "\n", "import numpy as np\n", "import pandas as pd\n", "import xarray as xr\n", "\n", "import matplotlib.pyplot as plt\n", "import cartopy.crs as ccrs\n", "\n", "import intake\n", "import healpix\n", "import easygems.healpix as egh\n", "\n", "import tobac" ] }, { "cell_type": "code", "execution_count": 2, "id": "34cb400e-fce9-4386-9b16-44cbb320ecee", "metadata": { "ExecuteTime": { "end_time": "2025-12-21T04:02:35.932820Z", "start_time": "2025-12-21T04:02:35.931018Z" }, "execution": { "iopub.execute_input": "2026-02-02T20:31:10.825502Z", "iopub.status.busy": "2026-02-02T20:31:10.825294Z", "iopub.status.idle": "2026-02-02T20:31:10.827153Z", "shell.execute_reply": "2026-02-02T20:31:10.826760Z" } }, "outputs": [], "source": [ "import warnings\n", "warnings.filterwarnings(\"ignore\", category=FutureWarning)" ] }, { "cell_type": "markdown", "id": "0c6187bc-8d53-495d-af24-2eb2dc0f92f0", "metadata": {}, "source": [ "## Data access and pre-processing\n", "\n", "We start by accessing the online NextGEMS catalogue. The cycle 4 ICON model data is stored in healpix form, which is a hierarchichal format with multiple time and spatial resolution options:" ] }, { "cell_type": "code", "execution_count": 3, "id": "5c3559cf-727d-44b4-92e2-1bf81b328b5c", "metadata": { "ExecuteTime": { "end_time": "2025-12-21T04:02:36.235445Z", "start_time": "2025-12-21T04:02:35.936315Z" }, "execution": { "iopub.execute_input": "2026-02-02T20:31:10.828399Z", "iopub.status.busy": "2026-02-02T20:31:10.828308Z", "iopub.status.idle": "2026-02-02T20:31:11.299333Z", "shell.execute_reply": "2026-02-02T20:31:11.298822Z" } }, "outputs": [ { "data": { "text/html": [ "
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62849 rows × 16 columns
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| 62845 | \n", "96 | \n", "1449 | \n", "200.400000 | \n", "194.200002 | \n", "5 | \n", "325 | \n", "82402 | \n", "2024-07-02 | \n", "2024-07-02 00:00:00 | \n", "-10.450000 | \n", "... | \n", "23 | \n", "6.988180e+10 | \n", "26 | \n", "6.745237e+10 | \n", "96.962082 | \n", "155.393951 | \n", "202.544235 | \n", "235.423019 | \n", "11.116196 | \n", "5.220869e+10 | \n", "
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62849 rows × 27 columns
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