Characterizing the sea ice algae chlorophyll a-snow depth relationship over Arctic spring melt using transmitted irradiance
Characterizing the sea ice algae chlorophyll a-snow depth relationship over Arctic spring melt using transmitted irradiance
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DOI：
10.1016/j.jmarsys.2014.01.008
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发表时间：
2015-07-01
影响因子：
2.8
通讯作者：
Gosselin, M.
中科院分区：
文献类型：
--
作者：
Campbell, K.;Mundy, C. J.;Gosselin, M.
2011年4月27日至6月13日，对努纳武特艾伦湾第一年海冰的底层冰藻叶绿素a(Chla)-雪深(H-S)关系进行了研究。一种透射式辐照度技术被用来估计整个时期内覆盖和清除积雪的时间序列位置的冰藻Chla。此外，在垂直于主要雪漂移方向的横断面和短期放雪实验点上估计了chla。Chla与大部分积雪深度的关系在春季表现为4个阶段：光限制(负相关)、过渡期(无相关)、与较高透射率相关的Chl下降(正相关)和独立于H-S的末期Chl下降(无相关)。除雪区下的藻类Chla较低，较早达到零Chla，且下降速度快于积雪控制区。结果表明，除雪通过光抑制引起这些Chla反应，以及在春季晚些时候冰雪融化。基于这项研究，我们提出，如果天气事件发生在春季晚些时候，能够迅速融化积雪的天气事件可能会显着耗尽底层冰川，并导致水华提前终止。(C)2014爱思唯尔B.V.保留所有权利。
The bottom ice algae chlorophyll a (chl a)-snow depth (H-s) relationship was investigated for first-year sea ice in Allen Bay, Nunavut, from 27 April to 13 June 2011. A transmitted irradiance technique was used to estimate ice algae chl a throughout the period at time series locations covered and cleared of snow. Furthermore, chl a was estimated along transects perpendicular to dominant snowdrift orientation, and at short-term snow clear experimental sites. The association between chl a and most snow depths was characterized by four phases over the spring; light limitation (negative relationship), a transitional period (no relationship), chl a decline associated with higher transmitted irradiance (positive relationship), and a final phase of chl a decline independent from H-s (no relationship). Algal chl a under areas cleared of snow was lower, reached zero chl a earlier and declined faster than snow-covered control sites. Results indicated that snow removal caused these chl a responses through photoinhibition, as well as ice melt later in the spring. Based on this research we propose that weather events that can rapidly melt the snowpack could significantly deplete bottom ice chl a and cause early termination of the bloom if they occur late in the spring. (C) 2014 Elsevier B.V. All rights reserved.