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A. Valente et al.: A compilation of global bio-optical in situ data 
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48. 
Figure 5. Global distribution of remote-sensing reflectance per data set in the final table. The data sources are identified with different 
colours. Points show locations where at least one observation is available. Crosses show sites from where time series data of remote-sensing 
reflectance are available. 
100 
IT TTITT tm TU TUT IT tn T7TTFTTTIT 
1: 5989 
2.0.92 
Dias: 0.114 
slope: 1.00 
nt.: 0.255 
104 
E 
0.1 
0.01 
0.001 0.01 0.1 1 10 100 
HPLC chlorophyll-a concentration (mg m’) 
Figure 6. Comparison of coincident observations of chlorophyll- 
a concentration derived with different methods (“chla_fluor” and 
“Chla_hple””). The data were transformed prior to regression analy- 
sis to account for their log-normal distribution. 
Platt and Shubha Sathyendranath. This is a collection of bio- 
optical in situ data collected during cruises predominantly 
in the Northwest Atlantic, but also from the Indian Ocean, 
South Pacific, and Central Atlantic (see Sathyendranath et 
al., 2009 for additional details regarding the cruises). It com- 
prises measurements of phytoplankton pigments and algal 
pigment absorption coefficients. The time of day was un- 
available and was set to 12:00:00 (UTC). These observations 
zarth Syst. Sci. Data. 14. 5737-5770. 202: 
Te 
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4000 
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2500 
2 2000 
5 1500 
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8 chla hplec (N=272151 
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Ü 
ee "ae 
0 
0.001 D.01 0.1 1 10 10C 
chlorophyll-a concentration (mg m) 
Figure 7. Number of observations per chlorophyll-a concentration 
acquired with different methods (“chla_fluor” and “chla_hplc””). 
were flagged with “1” in column “flag_time”. The compiled 
varlables were “chla_hple”, “chla_fluor”. and “aph”. 
2.2.27 Bio-optical data from Tara expeditions (TARA) 
The Tara expeditions consist of several cruises around the 
world, some with durations of several years, designed to 
study and understand the distribution of planktonic organ- 
isms in the world ocean. The discrete observations of re- 
mote sensing reflectance and chlorophyll-@ concentration 
from HPLC measurements taken during the Tara “Oceans” 
(2009-2013) and “Mediterranean” (2014) expeditions were 
considered in this work. These data were provided to ESA 
OC-CCI project by Emmanuel Boss and were available in 
the SeaBASS archive. The remote sensing reflectances were 
corrected for the bidirectional nature of the light field (Morel 
nttos://dol.org/10.5194/essd-14-5737-2022