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fvcom-toolbox
Commit d431d868 authored by Pierre Cazenave's avatar Pierre Cazenave
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Move all the additional steps outside the month loop since they only need... 

Move all the additional steps outside the month loop since they only need occur at the end once we have all the dependent data downloaded. We also do the de-averaging here.
parent ea189813
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Showing with 105 additions and 106 deletions
fvcom_prepro/get_CFS_forcing.m
View file @ d431d868
......@@ -471,112 +471,6 @@ for t = 1:nt
end
end
end
% Calculate the net long and shortwave radiation fluxes.
if isfield(data, 'uswsfc') && isfield(data, 'dswsfc')
data.nswsfc.data = data.uswsfc.data - data.dswsfc.data;
data.nswsfc.time = data.uswsfc.time;
data.nswsfc.lon = data.uswsfc.lon;
data.nswsfc.lat = data.uswsfc.lat;
end
% Convert precipitation from kg/m^2/s to m/s (required by FVCOM) by
% dividing by freshwater density (kg/m^3).
if isfield(data, 'prate')
data.prate.data = data.prate.data / 1000;
end
% Evaporation can be approximated by:
%
% E(m/s) = lhtfl/Llv/rho
%
% where:
%
% lhtfl = "Mean daily latent heat net flux at the surface"
% Llv = Latent heat of vaporization (approx to 2.5*10^6 J kg^-1)
% rho = 1025 kg/m^3
%
if isfield(data, 'prate') && isfield(data, 'lhtfl')
Llv = 2.5 * 10^6;
rho = 1025; % using a typical value for seawater.
Et = data.lhtfl.data / Llv / rho;
data.P_E.data = data.prate.data - Et;
% Evaporation and precipitation need to have the same sign for
% FVCOM (ocean losing water is negative in both instances). So,
% flip the evaporation here.
data.Et.data = -Et;
end
% Get the fields we need for the subsequent interpolation. Find the
% position of a sensibly sized array (i.e. not 'topo', 'rhum' or
% 'pres').
for vv = 1:length(fields)
if ~isempty(varlist) && max(strcmp(fields{vv}, varlist)) ~= 1
continue
end
switch fields{vv}
% Set ii in each instance in case we've been told to only
% use one of the three (four including pres and press)
% alternatively gridded data.
case {'topo', 'rhum', 'pres', 'press'}
ii = vv;
continue
otherwise
% We've got one, so stop looking.
ii = vv;
break
end
end
data.lon = data.(fields{ii}).lon;
data.lon(data.lon > 180) = data.lon(data.lon > 180) - 360;
data.lat = data.(fields{ii}).lat;
% Convert temperature to degrees Celsius (from Kelvin)
if isfield(data, 'tmp2m')
data.tmp2m.data = data.tmp2m.data - 273.15;
end
% Make sure all the data we have downloaded are the same shape as
% the longitude and latitude arrays.
for aa = 1:length(fields)
if ~isempty(varlist) && max(strcmp(fields{aa}, varlist)) ~= 1
% We've been given a list of variables to extract, so skip those
% that aren't in that list
continue
else
if isfield(data, fields{aa})
[px, py] = deal(length(data.(fields{aa}).lon), length(data.(fields{aa}).lat));
[ncx, ncy, ~] = size(data.(fields{aa}).data);
if ncx ~= px || ncy ~= py
data.(fields{aa}).data = permute(data.(fields{aa}).data, [2, 1, 3]);
% Check everything's OK now.
[ncx, ncy, ~] = size(data.(fields{aa}).data);
if ncx ~= px || ncy ~= py
error('Unable to resize data arrays to match position data orientation. Are these on a different horizontal grid?')
else
if ftbverbose
fprintf('Matching %s data and position array dimensions\n', fields{aa})
end
end
end
else
warning('Variable %s requested but not downloaded.', fields{aa})
end
end
end
end
% Concatenate each year's worth of data.
for aa = 1:length(fields)
if exist('forcing', 'var') && isfield(forcing, (fields{aa}))
forcing.(fields{aa}).data = cat(3, forcing.(fields{aa}).data, data.(fields{aa}).data);
forcing.(fields{aa}).time = cat(1, forcing.(fields{aa}).time, data.(fields{aa}).time);
forcing.(fields{aa}).lon = data.(fields{aa}).lon;
forcing.(fields{aa}).lat = data.(fields{aa}).lat;
else
forcing = data;
end
end
% Now we have the data, we need to fix the averaging to be hourly instead
......@@ -606,6 +500,111 @@ for f = 1:length(fields)
end
data.(fields{f}).data = fixed;
clearvars fixed
if ftbverbose; fprintf('done.\n'); end
end
end
% Calculate the net long and shortwave radiation fluxes.
if isfield(data, 'uswsfc') && isfield(data, 'dswsfc')
data.nswsfc.data = data.uswsfc.data - data.dswsfc.data;
data.nswsfc.time = data.uswsfc.time;
data.nswsfc.lon = data.uswsfc.lon;
data.nswsfc.lat = data.uswsfc.lat;
end
% Convert precipitation from kg/m^2/s to m/s (required by FVCOM) by
% dividing by freshwater density (kg/m^3).
if isfield(data, 'prate')
data.prate.data = data.prate.data / 1000;
end
% Evaporation can be approximated by:
%
% E(m/s) = lhtfl/Llv/rho
%
% where:
%
% lhtfl = "Mean daily latent heat net flux at the surface"
% Llv = Latent heat of vaporization (approx to 2.5*10^6 J kg^-1)
% rho = 1025 kg/m^3
%
if isfield(data, 'prate') && isfield(data, 'lhtfl')
Llv = 2.5 * 10^6;
rho = 1025; % using a typical value for seawater.
Et = data.lhtfl.data / Llv / rho;
data.P_E.data = data.prate.data - Et;
% Evaporation and precipitation need to have the same sign for FVCOM
% (ocean losing water is negative in both instances). So, flip the
% evaporation here.
data.Et.data = -Et;
end
% Get the fields we need for the subsequent interpolation. Find the
% position of a sensibly sized array (i.e. not 'topo', 'rhum' or 'pres').
for vv = 1:length(fields)
if ~isempty(varlist) && max(strcmp(fields{vv}, varlist)) ~= 1
continue
end
switch fields{vv}
% Set ii in each instance in case we've been told to only use one
% of the three (four including pres and press) alternatively
% gridded data.
case {'topo', 'rhum', 'pres', 'press'}
ii = vv;
continue
otherwise
% We've got one, so stop looking.
ii = vv;
break
end
end
data.lon = data.(fields{ii}).lon;
data.lon(data.lon > 180) = data.lon(data.lon > 180) - 360;
data.lat = data.(fields{ii}).lat;
% Convert temperature to degrees Celsius (from Kelvin)
if isfield(data, 'tmp2m')
data.tmp2m.data = data.tmp2m.data - 273.15;
end
% Convert specific humidity to relative humidity.
if isfield(data, 'q2m') && isfield(data, 'tmp2m') && isfield(data, 'pressfc')
% Convert pressure from Pascals to millibars. Save relative humidity as
% percentage. Convert specific humidity to percent too.
data.rhum.data = 100 * qair2rh(data.q2m.data, data.tmp2m.data, data.pressfc.data / 100);
end
if isfield(data, 'q2m')
data.q2m.data = 100 * data.q2m.data;
end
% Make sure all the data we have downloaded are the same shape as the
% longitude and latitude arrays.
for aa = 1:length(fields)
if ~isempty(varlist) && max(strcmp(fields{aa}, varlist)) ~= 1
% We've been given a list of variables to extract, so skip those
% that aren't in that list
continue
else
if isfield(data, fields{aa})
[px, py] = deal(length(data.(fields{aa}).lon), ...
length(data.(fields{aa}).lat));
[ncx, ncy, ~] = size(data.(fields{aa}).data);
if ncx ~= px || ncy ~= py
data.(fields{aa}).data = ...
permute(data.(fields{aa}).data, [2, 1, 3]);
% Check everything's OK now.
[ncx, ncy, ~] = size(data.(fields{aa}).data);
if ncx ~= px || ncy ~= py
error(['Unable to resize data arrays to match ', ...
'position data orientation. Are these on a ', ...
'different horizontal grid?'])
end
end
else
warning('Variable %s requested but not downloaded.', fields{aa})
end
end
end
......
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