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function []=bp_ECCO_GRACE(); |
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% BP_ECCO_GRACE |
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% - reads ECCO and GRACE bottom pressure fields from file |
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% - computes monthly area average over Barents Sea |
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% - display monthly time series and correlation |
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|
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fprintf('\n'); help bp_ECCO_GRACE; |
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|
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%load grid from nctiles_grid/ |
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grid_load; gcmfaces_global; |
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|
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%option to subtract ECCO time-variable global-mean BP (by default rmGloMean=0 |
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% and GRACE_jpl_rl05m_SpatialMean.asc is instead added to GRACE BP maps) |
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rmGloMean=0; |
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|
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%input directories |
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dir_GRACE='input_ecco/input_bp/'; |
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dir_ECCO='nctiles_monthly/PHIBOT/'; |
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|
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%read GRACE global mean |
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glo_GRACE=NaN*zeros(1,240); |
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fid=fopen([dir_GRACE 'GRACE_jpl_rl05m_SpatialMean.asc'],'rt'); |
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for ii=1:4; tmp1=fgetl(fid); end; |
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for ii=1:240; |
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tmp1=fgetl(fid); |
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tmp1=str2num(tmp1); |
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glo_GRACE(ii)=tmp1(4); |
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end; |
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fclose(fid); |
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glo_GRACE(glo_GRACE==-999)=NaN; |
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|
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%read GRACE |
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fld_GRACE=repmat(NaN*mygrid.XC,[1 1 240]); |
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for yy=1992:2011; |
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tmp1=read_bin([dir_GRACE 'GRACE_jpl_rl05m_' num2str(yy)]); |
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fld_GRACE(:,:,[1:12]+12*(yy-1992))=tmp1; |
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end; |
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|
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%read ECCO |
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fld_ECCO=read_nctiles([dir_ECCO 'PHIBOT']); |
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|
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%convert ECCO to cm |
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fld_ECCO=10.1937*fld_ECCO; |
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|
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%apply common NaN mask to ECCO and GRACE maps |
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msk=1*(fld_GRACE>-999); msk(msk==0)=NaN; |
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fld_GRACE=msk.*fld_GRACE; |
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fld_ECCO=msk.*fld_ECCO; |
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|
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%NaN mask for GRACE / ECCO time series |
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msk_tim=1*(nansum(msk,0)>0); |
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msk_tim(msk_tim==0)=NaN; |
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|
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%subtract time mean |
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fld_GRACE=fld_GRACE-repmat(nanmean(fld_GRACE,3),[1 1 240]); |
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fld_ECCO=fld_ECCO-repmat(nanmean(fld_ECCO,3),[1 1 240]); |
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|
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%add global mean for GRACE |
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fld_GRACE=fld_GRACE+mk3D(glo_GRACE,fld_GRACE); |
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|
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%subtract time variable global mean |
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if rmGloMean; |
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tmp1=nanmedian(fld_GRACE,[],0); |
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fld_GRACE=fld_GRACE-mk3D(tmp1,fld_GRACE); |
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tmp1=nanmedian(fld_ECCO,[],0); |
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fld_ECCO=fld_ECCO-mk3D(tmp1,fld_ECCO); |
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end; |
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|
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%Barents Sea (area weighted mean) time series: |
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msk=v4_basin('barents').*mygrid.mskC(:,:,1);; |
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mskXrac=repmat(msk.*mygrid.RAC,[1 1 240]); |
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bp_ECCO=nansum(fld_ECCO.*mskXrac,0)./nansum(mskXrac,0); |
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bp_GRACE=nansum(fld_GRACE.*mskXrac,0)./nansum(mskXrac,0); |
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|
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%apply common NaN mask to ECCO and GRACE time series |
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bp_GRACE=msk_tim.*bp_GRACE; |
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bp_ECCO=msk_tim.*bp_ECCO; |
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|
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%display results |
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figure; set(gca,'FontSize',12); x_tim=[0.5:239.5]/12+1992; |
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plot(x_tim,bp_GRACE,'b.-'); hold on; plot(x_tim,bp_ECCO,'r.-'); |
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legend('GRACE','ECCO'); ylabel('Bottom pressure anomaly (in cm)'); |
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title('Barents Sea, area averaged, monthly means'); |
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|
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tmp0=~isnan(msk_tim); |
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tmp1=corrcoef(bp_ECCO(tmp0),bp_GRACE(tmp0)); |
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fprintf(' Correlation coefficient = %g\n\n',tmp1(2,1)); |
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