Table 1 Summary of cruise data for this study.

MQ, Milli-Q water; NaOH, supernatant following alkaline precipitation of phosphate; Unp., unpublished.

Cruise no.IDRegionNo. of samples(<30 m)MethodFrozenPrefilteredBlankRef.
1Cook-BookNorth East Pacific21565MAGICYesNoNaOHUnp.
2BULACentral Pacific488MAGICYesNoNaOHUnp.
3BeachbashCentral Pacific13142MAGICYesNoNaOHUnp.
4SUPER-HI-CATNorth East Pacific8442MAGICYesNoNaOHUnp.
5BIOSOPESouth East Pacific28877MAGICNoYesNaOH(6)
6PROSOPEMediterranean Sea13726MAGICNoYesNaOH(39)
7AMT12Atlantic Ocean9345LWCCNoNoMQ(10)
8AMT13Atlantic Ocean6010LWCCNoNoMQ(10)
9AMT14Atlantic Ocean20959LWCCNoNoMQ(10)
10AMT15Atlantic Ocean220128LWCCNoNoMQ(10)
11AMT16Atlantic Ocean272117LWCCNoNoMQ(10)
12AMT17Atlantic Ocean27692LWCCNoNoMQ(10)
13BOUMMediterranean Sea424167LWCCNoNoMQ(40)
14AR16Western North Atlantic9445MAGICYesYesNaOHUnp.
15COST2005North Pacific17460LWCCNoNoMQ(41)
16CR 1455, CR 1487, CR 950South China Sea2424MAGICYesNoNaOH(42)
17POOB2North Pacific1313MAGICYesNoNaOH(43)
18GA03North Atlantic335168LWCCNoNoMQ(44)
19KH04-5West Pacific Ocean13,99713,997LWCCNoNoNaOH(22)
20KH05-2West Pacific Ocean6,1756,175LWCCNoNoNaOH(22)
21SCSSouth China Sea4512LWCCNoNoMQ(19)
22MR09-01South Pacific3838LWCCYesNoNaOH(45)
23R/V OceanusNorth West Atlantic17175MAGICYesNoMQ(21)
24BATSNorth West Atlantic1815444MAGICYesYesNaOH(32)
25AE1319North West Atlantic4212MAGICYesYesNaOH(5)
26Trophic BATSNorth West Atlantic893183MAGICYesYesNaOH(32)
27NH1418Central Pacific18848MAGICYesYesNaOH(46)
28BVALNorth West Atlantic1,254290MAGICYesYesNaOH(5)
29AE1206/1219North West Atlantic11032MAGICYesYesNaOH(5)
30KH14-3Central North Pacific7439LWCCMixNoNaOH(47)
31KH09-5Central Indian Ocean4919LWCCNoNoNaOH(48)
32KH-06-2, MR07-01,
MR07-06, KT-06-21,
Nagasaki-Maru 242
West Pacific Ocean4343LWCCMixNoNaOH(49)
33Umitaka-Maru cruiseIndian Ocean7,0737073LWCCNoNoNaOH(50)
34HOTNorth Pacific2,545656MAGICYesNoNaOH(51)
35NH1417North East Pacific3828MAGICYesNoNaOH(52)
36MixedSouth China Sea2,2092209SPENoNoMQ(20)
37MixedSouth China Sea1,592912MAGICYesNoNaOH(53)
38GA06/D361Central North Atlantic176176LWCCNoNoMQ(54)
39GP13South West Pacific77791LWCCNoNoMQ(17)
40KT-05-24, KT-06-21, KT-07-22North West Pacific Ocean7,8387,838LWCCNoNoNaOH(55)
41GEOTRACES GApr08, JC150North Atlantic119119LWCCNoNoMQUnp.
42OUTPACESouth Pacific Ocean9516LWCCNoYesNone(56)