758 
A. Valente et al.: A compilation of global bio-optical in situ data 
(a) | 
TPSS 
SeaBASS 
NOMAD 
MERMAID | 
COASTCOLOUR 
AWI 
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(b) 
962 TPSS 
448 ScaBASS 
1190 NOMAD 
72 MERMAID 
593 COASTCOLOUR 
984 AW! 
10% 10 10° 105 1071, 10° 10° 
aph (55X nm) (m”} 
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10° 10* 10° 107 10, 10° 10 
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(c) 
SeaBASS 
NOMAD 
VERMAID 
COASTCOLOUR 
(d) 
1 SeaBASS 
1079 NOMAD 
33 MERMAID 
82 COASTCOLOUR 
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IH 
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105 10% 10° 10% 1077, 10° 10 
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105 104 10° 107 107, 10° 40’ 
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(e) [” 
SeaBASS 
NOMAD 
VERMAID 
COASTCOLOUR 
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359 NOMAD 
33 MERMAID | 
131 COASTCOLOUR 
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le a Dt 4 te] Le N Mk —. 
10? 4107 40° 10’ 10% 10% 4107 10° 10° 
kd (44X nm) (m” '} kd (55X nm) (m''} 
Figure 12. The distribution of: (a) “aph”” at 44X nm; (b) “aph”” at 55X; (c) “adg” at 44X nm; (d) “adg” at 55X; (e) “bbp”” at 44X nm; (f) “bbp” 
at 55X; (g) “kd” at 44X nm; (h) “kd” at 55X nm. Data were first searched at 445 and 555 nm, and then with a search window up to 8 nm, to 
include data at 547 nm. The graphical convention is identical to Fig. 2. 
sents an increase of — 4% (ie. from 79731 to 82 543) when 
compared to the previous version (Valente et al., 2019). The 
present version represents a major increase in the number of 
recent observations. For the combined chlorophyll data set, 
533 stations were available in previous version for the pe- 
riod 2016-2017 (previous version had chlorophyll data un- 
dl 2017). Now, there are 5140 stations for the period 2016— 
2021, which represents an increase of — 964 % for the pe- 
riod of 2016 onwards. Overall, data distribution and spatial 
coverage remain the same between present and previous ver- 
sions. Approximately 10 %, 50 %, and 40 % of observations 
are from oligotrophic (< 0.1 mg m”7*), mesotrophic (0.1 
| mg m”), and eutrophic (> 1 mg m7}) waters, respectively. 
When compared with the proportions of the world ocean in 
chese trophic classes, 56 % oligotrophic, 42 % mesotrophic, 
and 2% eutrophic (Antoine et al., 1996), oligotrophic wa- 
ters are still under-represented relative to eutrophic waters in 
zarth Syst. Sci. Data. 14. 5737-5770. 202, 
the compilation. The combined chlorophyll data set is also 
still unevenly distributed geographically, with higher cover- 
age in the Northern Hemisphere (Fig. 3). The spatial dis- 
tribution of the chlorophyll values for the combined data 
set (Fig. 8) shows a good agreement with known biogeo- 
graphical features, such as lower chlorophyll values in the 
subtropical gyres and higher values in temperate, coastal, 
and upwelling regions. Many regions show a good spatial 
coverage (e.g. Atlantic and Pacific Ocean), while others are 
less well sampled (e.g. Southern and Indian oceans). Of the 
contributing data sets, SeaBASS provides the most exten- 
sive global spatial coverage (Fig. 9). Other data sets also 
provide broad coverage from several locations across the 
globe (NOMAD, GEPCO, MAREDAT, TARA). The ICES, 
MERMAID, and BODC data are mainly located along the 
coastal regions of Europe. The AMT and many AWI data 
mostly cover the Atlantic Ocean. Other AWI data cover the 
httos://doli.org/10.5194/essd-14-5737-2022