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WFDE5Factors.m
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% By Florian Zabel, University of Basel, Switzerland (2024)
% Contact: [email protected]
function WFDE5Factors(parameters_out,path_wfde5,outdir,startyear,endyear)
units_out=[];
parameters_wfde5=[];
if(find(contains(parameters_out,'tas','IgnoreCase',true)>=1))
units_out=[units_out,{'K'}];
parameters_wfde5=[parameters_wfde5,{'Tair'}];
end
if(find(contains(parameters_out,'hurs','IgnoreCase',true)>=1))
units_out=[units_out,{'%'}];
parameters_wfde5=[parameters_wfde5,{'Qair'}];
end
if(find(contains(parameters_out,'rsds','IgnoreCase',true)>=1))
units_out=[units_out,{'W m-2'}];
parameters_wfde5=[parameters_wfde5,{'SWdown'}];
end
if(find(contains(parameters_out,'rlds','IgnoreCase',true)>=1))
units_out=[units_out,{'W m-2'}];
parameters_wfde5=[parameters_wfde5,{'LWdown'}];
end
if(find(contains(parameters_out,'ps','IgnoreCase',true)>=1))
units_out=[units_out,{'hPa'}];
parameters_wfde5=[parameters_wfde5,{'PSurf'}];
end
if(find(contains(parameters_out,'sfcwind','IgnoreCase',true)>=1))
units_out=[units_out,{'m s-1'}];
parameters_wfde5=[parameters_wfde5,{'Wind'}];
end
if(find(contains(parameters_out,'pr','IgnoreCase',true)>=1))
units_out=[units_out,{'mm/h'}];
parameters_wfde5=[parameters_wfde5,{'Rainf'}];
end
nyears=endyear-startyear+1;
load('wfde5_mask.mat');
%local solar time
res=0.5;
lst_offset=local_solar_time(res);
lst_offset=repmat(lst_offset,[300,1]);
%calculate local midnight in utc
midnight=lst_offset*(-1)+1;
midnight(midnight<=0)=midnight(midnight<=0)+24;
for parameterloop=1:length(parameters_out)
parameter_wfde5=parameters_wfde5{parameterloop};
parameter_out=parameters_out{parameterloop};
unit_out=units_out{parameterloop};
factor=NaN(300,720,24,366);
amp_prctle=NaN(300,720,4,366,'single');
dailyval=NaN(300,720,nyears,366,'single');
if(strcmpi(parameter_out,'tas')==1)
dailyval_min=NaN(300,720,nyears,366,'single');
dailyval_max=NaN(300,720,nyears,366,'single');
end
for doy=1:366
disp(['DOY: ',num2str(doy)]);
data_wfde5=NaN(360,720,24,nyears);
if(strcmpi(parameter_out,'pr')==1)
data_wfde5_snowf=NaN(360,720,24);
end
if(strcmpi(parameter_out,'hurs')==1)
data_wfde5_t=NaN(360,720,24,nyears);
data_wfde5_p=NaN(360,720,24,nyears);
end
n=1;
for year=startyear:endyear
Month=month(doy); %month
DayMonth=day(doy); %day of month
band=DayMonth*24-23;
if(leap_year(year)==0 && Month==2 && DayMonth==29)
n=n+1;
continue
end
data=NaN(300,720,24);
cdir=[path_wfde5,filesep,parameter_wfde5,filesep];
filelist = dir([cdir,'*_',num2str(year),num2str(Month,'%.2i'),'*.nc']);
filename=[filelist.name];
filename=filename(1:length(filename)-3);
disp(['read WFDE5 file ',filename,' for DOY ',num2str(doy)]);
finfo = ncinfo([cdir,filename,'.nc']);
varname=finfo.Variables(1,4).Name;
x=finfo.Dimensions(1,find(strcmpi({finfo.Dimensions.Name},'lon')==1)).Length;
y=finfo.Dimensions(1,find(strcmpi({finfo.Dimensions.Name},'lat')==1)).Length;
z=finfo.Dimensions(1,find(strcmpi({finfo.Dimensions.Name},'time')==1)).Length;
vartime='time';
times = ncread([cdir,filename,'.nc'],vartime);
times=times/24;
timeoffset=datenum(['01.01.',num2str(1900),' 00:00:00'],'dd.mm.yyyy HH:MM:SS');
formatOut='dd.mm.yyyy HH:MM:SS';
times=double(times)+timeoffset;
year_nc=str2double(datestr(times(band),'yyyy'));
month_nc=str2double(datestr(times(band),'mm'));
day_nc=str2double(datestr(times(band),'dd'));
%read netcdf file for doy
data_wfde5(:,:,:,n)=rot90(ncread([cdir,filename,'.nc'],varname,[1 1 band],[x y 24]));
if(strcmpi(parameter_out,'pr')==1)
filename=strrep(filename,'Rainf','Snowf');
cdir=strrep(cdir,'Rainf','Snowf');
disp(['read WFDE5 file ',filename,' for DOY ',num2str(doy)]);
finfo = ncinfo([cdir,filename,'.nc']);
varname=finfo.Variables(1,4).Name;
data_wfde5_snowf=rot90(ncread([cdir,filename,'.nc'],varname,[1 1 band],[x y 24]));
data_wfde5(:,:,:,n)=data_wfde5(:,:,:,n)+data_wfde5_snowf;
end
if(strcmpi(parameter_out,'hurs')==1)
filename=strrep(filename,'Qair','Tair');
cdir=strrep(cdir,'Qair','Tair');
disp(['read WFDE5 file ',filename,' for DOY ',num2str(doy)]);
finfo = ncinfo([cdir,filename,'.nc']);
varname=finfo.Variables(1,4).Name;
data_wfde5_t(:,:,:,n)=rot90(ncread([cdir,filename,'.nc'],varname,[1 1 band],[x y 24]));
filename=strrep(filename,'Tair','PSurf');
cdir=strrep(cdir,'Tair','PSurf');
disp(['read WFDE5 file ',filename,' for DOY ',num2str(doy)]);
finfo = ncinfo([cdir,filename,'.nc']);
varname=finfo.Variables(1,4).Name;
data_wfde5_p(:,:,:,n)=rot90(ncread([cdir,filename,'.nc'],varname,[1 1 band],[x y 24]));
end
n=n+1;
end %year
%convert units
if strcmpi(parameter_out,'ps')==1
data_wfde5=data_wfde5/100; %convert surface pressure [Pa] to [hPa]
elseif strcmpi(parameter_out,'pr')==1
data_wfde5=data_wfde5*3600; %convert mass flux density to mm/h
elseif(strcmpi(parameter_out,'hurs')==1)
%convert specific humidity to relative humidity [%]
data_wfde5_t=single(data_wfde5_t-273.16); %[K] to [°C]
data_wfde5_p=single(data_wfde5_p/100); %[Pa] to [hPa=mbar]
%es according to Buck equation; t in °C; es in hPa
a=data_wfde5_t;
b=data_wfde5_t;
c=data_wfde5_t;
d=data_wfde5_t;
%over liquid water, T>0°C
a(data_wfde5_t>=0)=6.1121;
b(data_wfde5_t>=0)=18.678;
c(data_wfde5_t>=0)=234.5;
d(data_wfde5_t>=0)=257.14;
%over ice water, T<0°C
a(data_wfde5_t<0)=6.1115;
b(data_wfde5_t<0)=23.036;
c(data_wfde5_t<0)=333.7;
d(data_wfde5_t<0)=279.82;
es_buck=a.*exp((b-(data_wfde5_t./c)).*(data_wfde5_t./(d+data_wfde5_t))); %saturation vapour pressure [hPa]
e = data_wfde5 .* data_wfde5_p ./ (0.378 .* data_wfde5 + 0.622); %vapour pressure [hPa]
rh = e ./ es_buck *100; %relative humidity [%]
rh(rh>100)=100;
rh(rh<0)=0;
data_wfde5=rh;
end
%reduce noice for solar radiation
if(strcmpi(parameter_out,'rsds')==1)
data_wfde5(data_wfde5<0.1)=0;
end
%calculate daily mean/sum values for climate analogue fingerprint method
if(strcmpi(parameter_out,'pr')==1)
dailyval(:,:,:,doy)=squeeze(sum(data_wfde5(1:300,:,:,:),3,'omitnan'));
elseif(strcmpi(parameter_out,'tas')==1)
dailyval(:,:,:,doy)=squeeze(mean(data_wfde5(1:300,:,:,:),3,'omitnan'));
dailyval_min(:,:,:,doy)=squeeze(min(data_wfde5(1:300,:,:,:),[],3,'omitnan'));
dailyval_max(:,:,:,doy)=squeeze(max(data_wfde5(1:300,:,:,:),[],3,'omitnan'));
else
dailyval(:,:,:,doy)=squeeze(mean(data_wfde5(1:300,:,:,:),3,'omitnan'));
end
clear('data_wfde5','data','data_compound','data_wfde5_snowf','data_wfde5_t','data_wfde5_p');
end %doy
if(~exist(outdir))
mkdir(outdir)
end
%write daily sum/mean
load('lat');
lat(301:360)=[];
load('lon');
timestamps=1:366;
var_name='mean';
var_name_long='daily mean value';
unit_ncdf=[unit_out];
time_unit=['day of year (doy) [1-366], with leap day at doy 60'];
comment=[num2str(startyear),'-',num2str(endyear)];
filename=[outdir,filesep,parameter_out,'_WFDE5_mean_doy_',num2str(startyear),'-',num2str(endyear)];
if(strcmpi(parameter_out,'pr')==1)
var_name='sum';
var_name_long='daily sum value';
unit_ncdf=[unit_out];
filename=[outdir,filesep,parameter_out,'_WFDE5_sum_doy_',num2str(startyear),'-',num2str(endyear)];
end
write_netcdf_dailyval(dailyval,lat,lon,timestamps,var_name,var_name_long,unit_ncdf,time_unit,filename,comment); %save as netcdf
clear('dailyval');
%write daily max/min for tas
if(strcmpi(parameter_out,'tas')==1)
var_name='min';
var_name_long='daily min value';
unit_ncdf=[unit_out];
filename=[outdir,filesep,parameter_out,'_WFDE5_min_doy_',num2str(startyear),'-',num2str(endyear)];
write_netcdf_dailyval(dailyval_min,lat,lon,timestamps,var_name,var_name_long,unit_ncdf,time_unit,filename,comment); %save as netcdf
var_name='max';
var_name_long='daily max value';
unit_ncdf=[unit_out];
filename=[outdir,filesep,parameter_out,'_WFDE5_max_doy_',num2str(startyear),'-',num2str(endyear)];
write_netcdf_dailyval(dailyval_max,lat,lon,timestamps,var_name,var_name_long,unit_ncdf,time_unit,filename,comment); %save as netcdf
clear('dailyval_min','dailyval_max');
end
end %parameter
end