Long-term variation of surface phytoplankton chlorophyll a in the Southern Ocean during 1965-2002

The variation in the phytoplankton biomass over a decadal time scale, and its relationship with the Antarctic Circumpolar Wave (ACW) and climate change, has been poorly interpreted because of the limited satellite chlorophylla (chl a) data compared with the physical parameters from satellite. We analysed a long-term chl a dataset along the Japanese Antarctic Research Expedition (JARE) cruise tracks since 1965 to investigate inter-annual variation of phytoplankton biomass. In the Southern Ocean, increasing trends of chl a and the spreading of higher chl a area to the north with 3-7 year cycles were found. Although relationships between the decadal change in chl a and climate change such as variation of sea ice extent and the El Nino are still obscure, large variation of primary production in proportion to the chl a is implied.The chl a concentration of sea surface water has been measured routinely on board the icebreakers Fuji and Shirase during almost every cruise of the JARE.The download file contains chlorophyll a data collected from ship tracks on JARE voyages between 1965 and 2002.The field in this dataset are:Date (local time)YearLatitudeLongitudeCorrected Chlorophyll aSee the attached paper for more details.The publications on the data collected during the 1965-1976 and 1988-1993 cruises are listed in Fukuchi [1980] and Suzuki and Fukuchi [1997], respectively. For data on the 1977-1985 and 1994-1997 cruises, see [Kanda and Fukuchi, 1979; Fukuchi and Tamura, 1982; Tanimura, 1981; Watanabe and Nakajima, 1983; Ino and Fukuchi, 1984; Sasaki, 1984; Hamada et al., 1985; Fukuda et al., 1986; Hattori and Fukuchi, 1988; Midorikawa et al., 2000]. Data post 1998-2002 cruises is in Hirawake and Fukuchi [2004]. Data from the 1986-1987 will be published in the JARE data report of digital media, including all cruise data.Auxiliary Material for paper 2004GL021394 Long-term variation of surface phytoplankton chlorophyll a in the Southern Ocean during 1965-2002. Toru Hirawake, Tsuneo Odate and Mitsuo Fukuchi (National Institute of Polar Research, Tokyo) Geophys. Res. Lett., Vol (Num), doi:10.1029/2004GL021394 All of the chl a data have been reported in the publications of the National Institute of Polar Research (NIPR).

浮游植物生物量在十年时间尺度上的变化特征，及其与南极绕极波（Antarctic Circumpolar Wave, ACW）和气候变化的关联，此前因卫星遥感获取的叶绿素a（chlorophyll a, chl a）数据远少于卫星物理参数数据，而未能得到充分阐释。
本研究依托1965年以来日本南极科考队（Japanese Antarctic Research Expedition, JARE）巡航航线获取的长期叶绿素a数据集，分析了浮游植物生物量的年际变化特征。
在南大洋区域，研究发现叶绿素a浓度呈上升趋势，且高叶绿素a海域以3~7年为周期向北扩张。
尽管叶绿素a的十年尺度变化与海冰范围变化、厄尔尼诺等气候变化因子之间的关联仍不明确，但研究推测浮游植物初级生产力会随叶绿素a浓度发生显著变化。
日本南极科考队几乎每一次巡航任务中，均在富士号（Fuji）与白濑号（Shirase）破冰船上常规测定了表层海水叶绿素a浓度。
本次提供的下载文件包含1965年至2002年间日本南极科考队各巡航航线采集的叶绿素a数据。
本数据集包含以下字段：本地时间（Date）、年份（Year）、纬度（Latitude）、经度（Longitude）、校正后叶绿素a（Corrected Chlorophyll a）。
更多详细信息请参阅随附学术论文。
1965~1976年及1988~1993年科考航次采集数据的相关文献分别见于Fukuchi[1980]与Suzuki和Fukuchi[1997]。
1977~1985年及1994~1997年科考航次的数据可参阅文献[Kanda和Fukuchi, 1979; Fukuchi和Tamura, 1982; Tanimura, 1981; Watanabe和Nakajima, 1983; Ino和Fukuchi, 1984; Sasaki, 1984; Hamada等, 1985; Fukuda等, 1986; Hattori和Fukuchi, 1988; Midorikawa等, 2000]。
1998~2002年及之后科考航次的数据见于Hirawake与Fukuchi[2004]。
1986~1987年科考航次的数据将收录于日本南极科考队数字媒体版数据报告，该报告包含全部巡航采集的数据。
本数据集对应的辅助材料来自论文《1965~2002年南大洋表层浮游植物叶绿素a的长期变化》（论文编号2004GL021394），作者为Toru Hirawake、Tsuneo Odate与Mitsuo Fukuchi（东京国立极地研究所，National Institute of Polar Research, NIPR），发表于《Geophysical Research Letters》，卷期信息未明确标注，DOI:10.1029/2004GL021394。
所有叶绿素a数据均已发表于国立极地研究所（National Institute of Polar Research, NIPR）的相关出版物中。