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首页> 外文学位 >Estimation of air-sea carbon dioxide flux in Hudson Bay during the ice-free season using a combination of field data and satellite remote sensing products.
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Estimation of air-sea carbon dioxide flux in Hudson Bay during the ice-free season using a combination of field data and satellite remote sensing products.

机译：结合现场数据和卫星遥感产品，估算无冰季节哈德逊湾的海气中二氧化碳通量。

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摘要

The lack of baseline estimates of air-sea CO2 exchange in Arctic and sub-Arctic regions represents a major shortfall in our ability to understand how climate change may affect CO2 fluxes at high latitude. The 2005 ArcticNet cruise of Hudson Bay provided a rare comprehensive oceanographic survey of one such region. Ship-based observations of sea-surface fugacity of CO2 (ƒCO2sw) were made at 56 locations between September 15 and October 26, and were found to range from 259muatm in Hudson Strait to 425muatm at the entrance to James Bay. Strong relationships between ƒCO 2sw and river discharge were identified, with coastal waters observed to be supersaturated in ƒCO2sw with respect to the atmosphere (and thus a source of CO2), while off-shore waters were undersaturated (thus a sink). High correlation of ƒCO 2sw with salinity, sea surface temperature (SST), and colored dissolved organic matter (CDOM) suggest that thermodynamic effects and possibly the oxidation of riverine carbon were driving supersaturation in the coastal zone.;To expand the spatial and temporal domain of the study, a remote sensing approach was applied. Predictive algorithms for ƒCO 2sw were created from relationships with CDOM and SST; variables which can be measured from satellite remote sensing platforms. A SST-ƒ CO2sw algorithm was used with monthly maps of SST obtained from the MODIS aqua sensor to extrapolate ƒCO2sw in Hudson Bay for the 2005 ice-free season (August-October). Gas transfer velocities were estimated using twice-daily QuikSCAT wind retrievals, and by using a bulk aerodynamic approach the monthly flux of CO2 in Hudson Bay was calculated. The results of these calculations revealed that Hudson Bay acts as a source of CO2 during August and September (4.10 and 5.29 mmol m-2 day-1, respectively), but reverts to a sink of CO2 in October as the water temperature cools (-5.83 mmol-2 day-1). By integrating over the spatial extent of Hudson Bay and the 92 day open-water season, a positive flux of 0.93 TgC was estimated. This result is in contrast to most Arctic or sub-Arctic continental shelf seas, where usually strong absorptions of CO2 are observed. It is hypothesized that this difference is related to the strong influence of river discharge.;Future studies are necessary to constrain fluxes in Hudson Bay over an annual cycle and to determine the oceanographic controls on CO2 flux. However, this study is significant since it represents the first-ever examination of air-sea CO2 exchange in Hudson Bay.
机译：北极和次北极地区缺乏空气-海洋二氧化碳交换的基线估计值，这不足以说明我们了解气候变化如何影响高纬度地区的二氧化碳通量的能力上的重大不足。哈德逊湾（Hudson Bay）的2005年ArcticNet巡游提供了一个罕见的全面的海洋学调查，其中包括该区域。在9月15日至10月26日期间的56个地点进行了船上CO2逸散度（ƒCO2sw）观测，发现范围从哈德逊海峡的259muatm到James Bay入口的425muatm。确定了ƒCO2sw与河水排放之间的密切关系，观察到ƒCO2sw中沿海水相对于大气（因此是CO2的来源）是过饱和的，而近海水则是不饱和的（因此是汇）。 ƒCO2sw与盐度，海面温度（SST）和有色溶解有机物（CDOM）的高度相关性表明，热力学效应以及可能的河流碳氧化作用正在推动沿海地区的过饱和。在这项研究中，采用了遥感方法。根据与CDOM和SST的关系创建了ƒCO2sw的预测算法；可以从卫星遥感平台测量的变量。 SST-ƒCO2sw算法与从MODIS aqua传感器获得的SST月度地图一起使用，以推断哈德逊湾2005年无冰季节（8月至10月）的ƒCO2sw。使用每日两次QuikSCAT取风估算气体传输​​速度，并使用整体空气动力学方法计算哈德逊湾的CO2月通量。这些计算结果表明，哈德逊湾在8月和9月（分别为4.10和5.29 mmol m-2 day-1）期间充当了CO2的来源，但随着水温的降低，在10月又恢复为CO2的汇入（- 5.83 mmol-2天-1）。通过对哈德逊湾和92天的开放水域的空间范围进行积分，可以估算出0.93 TgC的正通量。这一结果与大多数北极或亚北极大陆架海形成鲜明对比，在这些大陆架海中通常观察到强烈的CO2吸收。据推测，这种差异与河流排放的强烈影响有关。未来的研究对于限制哈德逊湾的年通量和确定海洋对CO2通量的控制是必要的。然而，这项研究意义重大，因为它代表了哈德逊湾有史以来首次对海气二氧化碳交换的研究。

著录项

  • 作者

    Else, Brent Gordon Thomas.;

  • 作者单位

    University of Calgary (Canada).;

  • 授予单位 University of Calgary (Canada).;
  • 学科 Physical Geography.;Remote Sensing.
  • 学位 M.Sc.
  • 年度 2008
  • 页码 156 p.
  • 总页数 156
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然地理学;遥感技术;
  • 关键词

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