Phytoplankton absorption during POLARSTERN cruise ANT-XXVI/4 (PS75)

Samples were collected during the ANT-XXVI/4 expedition of the RV Polarstern in April/May 2010 along a South-to-North transect through the Atlantic Ocean from Punta Arenas (Chile) to Bremerhaven (Germany) at 32 CTD stations sampling at the surface, chlorophyll max. and 100 depth during noon time and at 57 stations sampling only surface waters through the moonpool of the ship (details see Taylor et al. 2013). Water samples were filtered on GF/F filters, shock-frozen in liquid nitro◦gen and stored at −80 C untilel further analysis in the home laboratory. Measurements of the phytoplankton absorption were carried out on a dual-beam UV/VIS spectrophotometer (Cary 4000, Varian Inc.) equipped with a 150 mm integrating sphere (external DRA-900, Varian, Inc. and Labsphere Inc., made from Spectralon (TM)) using a quantitative filterpad technique modified as described in details in Taylor et al. (2011). The data set is also collocated to Bracher (2015) phytoplankton pigment data and Bracher and Taylor (2021) particulate absorption data.

本数据集样品采集于2010年4-5月期间的极星号（RV Polarstern）ANT-XXVI/4科考航次，沿大西洋从智利蓬塔阿雷纳斯至德国不来梅哈芬的南北断面开展：在32个温盐深仪（CTD）站位，于正午时分采集表层水体、叶绿素最大浓度层以及100米深度的水样；另有57个站位仅通过船舶月池采集表层水样（详细信息参见Taylor等人2013年发表的研究）。采集的水样经GF/F型玻璃纤维滤膜过滤后，采用液氮速冻，并于-80℃条件下保存，直至运回国内实验室开展后续分析。浮游植物吸收系数的测量采用经改良的定量滤膜垫技术，改良方法详见Taylor等人2011年的研究，测量仪器为配备150 mm积分球的双光束紫外-可见分光光度计（Cary 4000，瓦里安公司），该积分球外置DRA-900附件，由瓦里安公司与Labsphere公司制造，采用Spectralon™材质。本数据集还与Bracher（2015）的浮游植物色素数据以及Bracher与Taylor（2021）的颗粒吸收数据完成了同位匹配。