# Copyright (c) 2017, Los Alamos National Security, LLC (LANS)
# and the University Corporation for Atmospheric Research (UCAR).
#
# Unless noted otherwise source code is licensed under the BSD license.
# Additional copyright and license information can be found in the LICENSE file
# distributed with this code, or at http://mpas-dev.github.com/license.html
#
import xarray as xr
from pyremap import LatLon2DGridDescriptor
from mpas_analysis.shared import AnalysisTask
from mpas_analysis.shared.climatology import RemapMpasClimatologySubtask, \
RemapObservedClimatologySubtask
from mpas_analysis.shared.plot import PlotClimatologyMapSubtask
from mpas_analysis.shared.io.utility import build_obs_path
[docs]
class ClimatologyMapSeaIcePondArea(AnalysisTask):
"""
An analysis task for melt pond area
"""
# Authors
# -------
# Elizabeth Hunke, Xylar Asay-Davis
[docs]
def __init__(self, config, mpas_climatology_task, hemisphere,
control_config=None):
"""
Construct the analysis task.
Parameters
----------
config : mpas_tools.config.MpasConfigParser
Configuration options
mpas_climatology_task : mpas_analysis.shared.climatology.MpasClimatologyTask
The task that produced the climatology to be remapped and plotted
hemisphere : {'NH', 'SH'}
The hemisphere to plot
control_config : mpas_tools.config.MpasConfigParser, optional
Configuration options for a control run (if any)
"""
# Authors
# -------
# Elizabeth Hunke, Xylar Asay-Davis
task_name = f'climatologyMapSeaIcePondArea{hemisphere}'
field_name = 'meltPondAreaFinalArea'
tags = ['climatology', 'horizontalMap', field_name, 'publicObs']
if hemisphere == 'NH':
tags = tags + ['arctic']
else:
tags = tags + ['antarctic']
# call the constructor from the base class (AnalysisTask)
super().__init__(config=config, taskName=task_name,
componentName='seaIce', tags=tags)
self.mpas_climatology_task = mpas_climatology_task
section_name = self.taskName
if hemisphere == 'NH':
hemisphere_long= 'Northern'
else:
hemisphere_long= 'Southern'
# read in what seasons we want to plot
seasons = config.getexpression(section_name, 'seasons')
if len(seasons) == 0:
raise ValueError(f'config section {section_name} does not contain '
f'valid list of seasons')
comparison_grid_names = config.getexpression(section_name,
'comparisonGrids')
if len(comparison_grid_names) == 0:
raise ValueError(f'config section {section_name} does not contain '
f'valid list of comparison grids')
variable_list = ['timeMonthly_avg_meltPondAreaFinalArea']
remap_climatology_subtask = RemapMpasPondAreaClimatology(
mpas_climatology_task=mpas_climatology_task,
parent_task=self,
climatology_name=f'{field_name}{hemisphere}',
variable_list=variable_list,
comparison_grid_names=comparison_grid_names,
seasons=seasons)
self.add_subtask(remap_climatology_subtask)
for season in seasons:
for comparison_grid_name in comparison_grid_names:
if control_config is None:
#echmod - no observations yet
# if hemisphere == 'SH' and season == 'ANN':
# ref_title_label = 'Observations (AnIceFlux)'
# gallery_name = 'Pond Area Fraction'
# diff_title_label = 'Model - Observations'
# obs_file_name = build_obs_path(
# config, 'seaIce',
# relativePathOption=f'melting{hemisphere}',
# relativePathSection=section_name)
# remap_observations_subtask = RemapAnIceFluxMeltingClimatology(
# parentTask=self, seasons=seasons,
# fileName=obs_file_name,
# outFilePrefix=f'{field_name}{hemisphere}',
# comparisonGridNames=comparison_grid_names)
# self.add_subtask(remap_observations_subtask)
# else:
remap_observations_subtask = None
gallery_name = 'Pond Area Fraction'
ref_title_label = None
ref_field_name = None
diff_title_label = 'Model - Observations'
else:
control_run_name = control_config.get('runs', 'mainRunName')
gallery_name = 'Pond Area Fraction'
ref_title_label = f'Control: {control_run_name}'
field_name = field_name
diff_title_label = 'Main - Control'
remap_observations_subtask = None
image_caption = f'Climatology Map of ' \
f'{hemisphere_long}-Hemisphere ' \
f'Fraction of Cell Covered in Ponds'
gallery_group = f'{hemisphere_long}-Hemisphere Melt Ponds'
# make a new subtask for this season and comparison grid
subtask = PlotClimatologyMapSubtask(
parentTask=self, season=season,
comparisonGridName=comparison_grid_name,
remapMpasClimatologySubtask=remap_climatology_subtask,
remapObsClimatologySubtask=remap_observations_subtask,
controlConfig=control_config)
subtask.set_plot_info(
outFileLabel=f'seaice_pondarea{hemisphere}',
fieldNameInTitle='Pond Area Fraction',
mpasFieldName=field_name,
refFieldName=field_name,
refTitleLabel=ref_title_label,
diffTitleLabel=diff_title_label,
unitsLabel=r' ',
imageCaption=image_caption,
galleryGroup=gallery_group,
groupSubtitle=None,
groupLink=f'{hemisphere.lower()}_pondarea',
galleryName=gallery_name,
extend='both',
prependComparisonGrid=False)
self.add_subtask(subtask)
class RemapMpasPondAreaClimatology(RemapMpasClimatologySubtask):
"""
A subtask for computing climatologies of melt pond area fraction
"""
def __init__(self, mpas_climatology_task, parent_task, climatology_name,
variable_list, seasons, comparison_grid_names):
"""
Construct the analysis task and add it as a subtask of the
``parent_task``.
Parameters
----------
mpas_climatology_task : mpas_analysis.shared.climatology.MpasClimatologyTask
The task that produced the climatology to be remapped
parent_task : mpas_analysis.shared.AnalysisTask
The parent task, used to get the ``taskName``, ``config`` and
``componentName``
climatology_name : str
A name that describes the climatology (e.g. a short version of
the important field(s) in the climatology) used to name the
subdirectories for each stage of the climatology
variable_list : list of str
A list of variable names in ``timeSeriesStatsMonthly`` to be
included in the climatologies
seasons : list of str, optional
A list of seasons (keys in ``shared.constants.monthDictionary``)
to be computed or ['none'] (not ``None``) if only monthly
climatologies are needed.
comparison_grid_names : list of {'latlon', 'antarctic'}
The name(s) of the comparison grid to use for remapping.
"""
subtask_name = f'remapMpasClimatology_meltPondArea'
# call the constructor from the base class
# (RemapMpasClimatologySubtask)
super().__init__(
mpas_climatology_task, parent_task, climatology_name,
variable_list, seasons, comparison_grid_names)
self.mpas_climatology_task = mpas_climatology_task
self.variable_list = variable_list
def setup_and_check(self):
"""
Perform steps to set up the analysis and check for errors in the setup.
"""
# first, call setup_and_check from the base class
# (RemapMpasClimatologySubtask), which will set up remappers and add
# variables to mpas_climatology_task
super().setup_and_check()
# don't add the variables and seasons to mpas_climatology_task until
# we're sure this subtask is supposed to run
self.mpas_climatology_task.add_variables(self.variable_list,
self.seasons)
def customize_masked_climatology(self, climatology, season):
"""
Compute the melt pond fraction
Parameters
----------
climatology : xarray.Dataset
the climatology data set
season : str
The name of the season to be masked
Returns
-------
climatology : xarray.Dataset
the modified climatology data set
"""
pondarea = self._compute_pondarea(climatology)
climatology['meltPondAreaFinalArea'] = pondarea
climatology.meltPondAreaFinalArea.attrs['units'] = ' '
climatology = climatology.drop_vars(self.variable_list)
return climatology
def _compute_pondarea(self, climatology):
"""
Compute the melt pond area fraction
"""
ds_restart = xr.open_dataset(self.restartFileName)
ds_restart = ds_restart.isel(Time=0)
pondarea = climatology['timeMonthly_avg_meltPondAreaFinalArea']
return pondarea