Secular trends in Arctic Ocean net primary production
Secular trends in Arctic Ocean net primary production
复制标题
DOI：
10.1029/2011jc007151
复制
发表时间：
2011-09-14
影响因子：
3.6
通讯作者：
van Dijken, Gert L.
中科院分区：
文献类型：
--
作者：
Arrigo, Kevin R.;van Dijken, Gert L.
一项基于卫星的研究利用海冰面积、海面温度和叶绿素a浓度记录了1998至2009年间北冰洋浮游植物净初级生产量(NPP)的日变化。1998年至2009年，北冰洋的年净初级生产力总量在统计上显著增加了20%(范围=441-585tg-yr(-1))，这主要是由于开放水域的范围(+27%)和开放水域季节的持续时间(+45天)的长期增加。在12年研究期内，北冰洋东部的国家生产总值增幅最大，最显著的是喀拉区(+70%)和西伯利亚区(+135%)。北冰洋单位面积的净初级生产力平均为101g Cm(-2)Yr(-1)，在研究期间没有明显变化。在西部地区，净生产总值从波弗特的71.3+/-11.0克Cm(-2)年(-1)到楚科奇地区的96.9+/-7.4克Cm(-2)年(-1)，而在生产力更高的北极东部，1998至2009年间，年净生产力从西伯利亚地区的101+/-15.8到拉普特夫的121+/-20.2不等。统计分析的结果表明，1979至1998年间(在SeaWiFS和MODIS推出之前)，北极净初级生产力总量可能平均为438+/-21.5tgc-yr(-1)。此外，当夏季最小冰盖在本世纪上半叶的某个时候降至零时，北冰洋的年净初级生产力可能达到730 Tg C yr(-1)。需要更好地了解进入北极表层水域的营养物质通量，以确定这些预计的增加是否可持续。
A satellite-based study was conducted to document daily changes in net primary production (NPP) by phytoplankton in the Arctic Ocean from 1998 to 2009 using fields of sea ice extent, sea surface temperature, and chlorophyll a concentrations. Total annual NPP over the Arctic Ocean exhibited a statistically significant 20% increase between 1998 and 2009 (range = 441-585 Tg C yr(-1)), due mainly to secular increases in both the extent of open water (+27%) and the duration of the open water season (+45 days). Increases in NPP over the 12 year study period were largest in the eastern Arctic Ocean, most notably in the Kara (+70%) and Siberian (+135%) sectors. NPP per unit area for the Arctic Ocean averaged 101 g C m(-2) yr(-1) with no significant change over the study period. In the western sectors, NPP ranged from 71.3 +/- 11.0 g C m(-2) yr(-1) in the Beaufort to 96.9 +/- 7.4 g C m(-2) yr(-1) in the Chukchi, while in the more productive eastern Arctic, annual NPP between 1998 and 2009 ranged from 101 +/- 15.8 in the Siberian sector to 121 +/- 20.2 in the Laptev. Results of a statistical analysis suggest that between 1979 and 1998 (prior to the launch of SeaWiFS and MODIS), total Arctic NPP likely averaged 438 +/- 21.5 Tg C yr(-1). Moreover, when summer minimum ice cover drops to zero sometime during the first half of this century, annual NPP in the Arctic Ocean could reach similar to 730 Tg C yr(-1). Nutrient fluxes into Arctic surface waters need to be better understood to determine if these projected increases are sustainable.