Marine Nitrous Oxide Emissions From Three Eastern Boundary Upwelling Systems Inferred From Atmospheric Observations
Marine Nitrous Oxide Emissions From Three Eastern Boundary Upwelling Systems Inferred From Atmospheric Observations
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DOI：
10.1029/2020gl087822
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发表时间：
2020-07
影响因子：
5.2
通讯作者：
A. Ganesan;M. Manizza;E. Morgan;C. Harth;E. Kozlova;T. Lueker;A. Manning;M. Lunt;Jens Mühle-Jens-Mühl
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文献类型：
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作者：
A. Ganesan;M. Manizza;E. Morgan;C. Harth;E. Kozlova;T. Lueker;A. Manning;M. Lunt;Jens Mühle-Jens-Mühl
东部边界上升流系统（EBUSs）是强温室气体一氧化二氮（N2 O）的沿海热点。然而，由于其在空间和时间上的显著不均匀性，其排放量的估计存在很大的不确定性。在这里，我们使用高频沿海大气测量和逆方法从四个主要EBUS中的三个获得了第一个多年，每月分辨率的N2 O排放量。我们发现北方加州、本格拉和南加那利上升流系统的平均N2 O排放量为57.7（51.4-63.9）Gg-N yr-1。我们还发现了本格拉EBUS附近的近海区域，该区域表现出大的排放脉冲，1个月内的排放量达到677 Gg-N yr-1。我们的研究结果强调，大气测量加上逆模型可以捕捉EBUS排放量的大变化，通过量化排放量在大的空间距离和较长的时间段相比，以前的方法使用传统的海洋测量。
Eastern Boundary Upwelling Systems (EBUSs) are coastal hotspots of the potent greenhouse gas nitrous oxide (N2O). However, estimates of their emissions suffer from large uncertainties due to their significant spatial and temporal heterogeneity. Here, we derive the first multiyear, monthly resolution N2O emissions from three of the four major EBUSs using high‐frequency coastal atmospheric measurements and an inverse method. We find average combined N2O emissions from the northern California, Benguela, and southern Canary upwelling systems to be 57.7 (51.4–63.9) Gg‐N yr−1. We also find an offshore region near the Benguela EBUS that exhibits large pulses of emissions with emissions that reach 677 Gg‐N yr−1 in 1 month. Our findings highlight that atmospheric measurements coupled with inverse modeling can capture the large variability in EBUS emissions by quantifying emissions over large spatial distances and over long time periods compared to previous methods using traditional oceanographic measurements.