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A monthly surface pCO2 product for the California Current Large Marine Ecosystem
Earth System Science Data ( IF 11.4 ) Pub Date : 2021-10-20 , DOI: 10.5194/essd-2021-328
Jonathan D. Sharp , Andrea J. Fassbender , Brendan R. Carter , Paige D. Lavin , Adrienne J. Sutton

Abstract. To calculate the direction and rate of carbon dioxide gas (CO2) exchange between the ocean and atmosphere, it is critical to know the partial pressure of CO2 in surface seawater (pCO2(sw)). Over the last decade, a variety of data products of global monthly pCO2(sw) have been produced, primarily for the open ocean on 1° latitude by 1° longitude grids. More recently, monthly products of pCO2(sw) that are more finely spatially resolved in the coastal ocean have been made available. A remaining challenge in the development of pCO2(sw) products is the robust characterization of seasonal variability, especially in nearshore coastal environments. Here we present a monthly data product of pCO2(sw) at 0.25° latitude by 0.25° longitude resolution in the Northeast Pacific Ocean, centered around the California Current System (CCS). The data product (RFR-CCS; Sharp et al., 2021; https://doi.org/10.5281/zenodo.5523389) was created using the most recent (2021) version of the Surface Ocean CO2 Atlas (Bakker et al., 2016) from which pCO2(sw) observations were extracted and fit against a variety of satellite- and model-derived surface variables using a random forest regression (RFR) model. We validate RFR-CCS in multiple ways, including direct comparisons with observations from moored autonomous surface platforms, and find that the data product effectively captures seasonal pCO2(sw) cycles at nearshore mooring sites. This result is notable because alternative global products for the coastal ocean do not capture local variability effectively in this region. We briefly review the physical and biological processes — acting across a variety of spatial and temporal scales — that are responsible for the latitudinal and nearshore-to-offshore pCO2(sw) gradients seen in RFR-CCS reconstructions of pCO2(sw).

中文翻译:

加利福尼亚洋流大型海洋生态系统的每月表面 pCO2 产品

摘要。要计算海洋和大气之间二氧化碳气体 (CO 2 ) 交换的方向和速率,了解表层海水中 CO 2的分压( p CO 2(sw) )至关重要。在过去十年中,已经产生了全球每月p CO 2(sw)的各种数据产品,主要针对 1° 纬度乘 1° 经度网格上的公海。最近,已提供在沿海海洋中空间分辨更精细的p CO 2(sw)月度产品。开发p CO 2(sw) 的剩余挑战产品是季节性变化的有力表征,尤其是在近岸沿海环境中。在这里,我们展示了以加利福尼亚洋流系统 (CCS) 为中心的东北太平洋地区 0.25° 纬度、0.25° 经度分辨率的p CO 2(sw)月度数据产品。数据产品(RFR-CCS;Sharp 等人,2021 年;https://doi.org/10.5281/zenodo.5523389)是使用最新(2021 年)版本的 Surface Ocean CO 2 Atlas(Bakker 等人)创建的., 2016) 其中p CO 2(sw)使用随机森林回归 (RFR) 模型提取观察结果并拟合各种卫星和模型衍生的表面变量。我们以多种方式验证 RFR-CCS,包括与系泊自主水面平台的观测结果进行直接比较,并发现数据产品有效地捕获了近岸系泊地点的季节性p CO 2(sw)循环。这一结果值得注意,因为沿海海洋的替代全球产品不能有效地捕捉该地区的局部变化。我们简要回顾了物理和生物过程 - 跨越各种空间和时间尺度 - 负责纬度和近岸到近海p CO 2(sw)p CO 2(sw) 的RFR-CCS 重建中看到的梯度。
更新日期:2021-10-20
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