function MMYY = extract_mo_apex_chl(date, P, Chl_b)
%
% finds all chl data from APEX data and stores [yyyy mm]
%
[yy,month,dd] = datevec(date); %converts date string to date vector
MMYY = [];
MMYY = [yy month P Chl_b]; %finds each year (once) in dataset and stores in array uyear
return
