CMORizer for NASA MERRA reanalysis (#3039)

Co-authored-by: Rémi Kazeroni <remi.kazeroni@dlr.de>

doc/sphinx/source/input.rst

@@ -355,6 +355,9 @@ A list of the datasets for which a CMORizers is available is provided in the fol
 +------------------------------+------------------------------------------------------------------------------------------------------+------+-----------------+
 | MAC-LWP                      | lwp, lwpStderr (Amon)                                                                                |   3  | NCL             |
 +------------------------------+------------------------------------------------------------------------------------------------------+------+-----------------+
+| MERRA                        | cli, clivi, clt, clw, clwvi, hur, hus, lwp, pr, prw, ps, psl, rlut, rlutcs, rsdt, rsut, rsutcs, ta,  |   3  | NCL             |
+|                              | tas, ts, ua, va, wap, zg (Amon)                                                                      |      |                 |
++------------------------------+------------------------------------------------------------------------------------------------------+------+-----------------+
 | MERRA2                       | sm (Lmon)                                                                                            |   3  | Python          |
 |                              | clt, pr, evspsbl, hfss, hfls, huss, prc, prsn, prw, ps, psl, rlds, rldscs, rlus, rlut, rlutcs, rsds, |      |                 |
 |                              | rsdscs, rsdt, tas, tasmin, tasmax, tauu, tauv, ts, uas, vas, rsus, rsuscs, rsut, rsutcs, ta, ua, va, |      |                 |

esmvaltool/cmorizers/data/datasets.yml

@@ -836,6 +836,13 @@ datasets:
       individually or by using the option "download all".
       Data is freely available, but a registration is required.
 
+  MERRA:
+    tier: 3
+    source: https://goldsmr3.gesdisc.eosdis.nasa.gov/data/MERRA_MONTHLY/
+    last_access: 2023-02-01
+    info: |
+      Use automatic download. That will download monthly data.
+
   MERRA2:
     tier: 3
     source: https://goldsmr4.gesdisc.eosdis.nasa.gov/data/MERRA2_MONTHLY/ https://goldsmr5.gesdisc.eosdis.nasa.gov/data/MERRA2_MONTHLY/

esmvaltool/cmorizers/data/downloaders/datasets/merra.py

@@ -0,0 +1,57 @@
+"""Script to download MERRA."""
+
+from datetime import datetime
+
+from dateutil import relativedelta
+
+from esmvaltool.cmorizers.data.downloaders.wget import NASADownloader
+
+
+def download_dataset(config, dataset, dataset_info, start_date, end_date,
+                     overwrite):
+    """Download dataset.
+
+    Parameters
+    ----------
+    config : dict
+        ESMValTool's user configuration
+    dataset : str
+        Name of the dataset
+    dataset_info : dict
+         Dataset information from the datasets.yml file
+    start_date : datetime
+        Start of the interval to download
+    end_date : datetime
+        End of the interval to download
+    overwrite : bool
+        Overwrite already downloaded files
+    """
+    if not start_date:
+        start_date = datetime(1979, 1, 1)
+    if not end_date:
+        end_date = datetime(2015, 12, 31)
+    loop_date = start_date
+
+    downloader = NASADownloader(
+        config=config,
+        dataset=dataset,
+        dataset_info=dataset_info,
+        overwrite=overwrite,
+    )
+
+    while loop_date <= end_date:
+        year = loop_date.year
+        downloader.download_folder(
+            "https://goldsmr3.gesdisc.eosdis.nasa.gov/data/MERRA_MONTHLY/"
+            f"MAIMNXINT.5.2.0/{year}/")
+        downloader.download_folder(
+            "https://goldsmr3.gesdisc.eosdis.nasa.gov/data/MERRA_MONTHLY/"
+            f"MAIMCPASM.5.2.0/{year}/")
+        downloader.download_folder(
+            "https://goldsmr3.gesdisc.eosdis.nasa.gov/data/MERRA_MONTHLY/"
+            f"MATMNXRAD.5.2.0/{year}/")
+        downloader.download_folder(
+            "https://goldsmr3.gesdisc.eosdis.nasa.gov/data/MERRA_MONTHLY/"
+            f"MATMFXCHM.5.2.0/{year}/")
+
+        loop_date += relativedelta.relativedelta(years=1)

esmvaltool/cmorizers/data/downloaders/wget.py

@@ -89,8 +89,8 @@ def download_folder(self, server_path, wget_options=None):
         """
         if wget_options is None:
             wget_options = []
-        wget_options = self._wget_common_options + ["-np", "--accept=nc,nc4"
-                                                    ] + wget_options
+        wget_options = self._wget_common_options + [
+            "-np", "--accept=nc,nc4,hdf"] + wget_options
         super().download_folder(server_path, wget_options)
 
     def download_file(self, server_path, wget_options=None):