Temporal variability in dissolved organic carbon and radiocarbon in the eastern North Pacific Ocean
Temporal variability in dissolved organic carbon and radiocarbon in the eastern North Pacific Ocean
复制标题
北太平洋东部溶解有机碳和放射性碳的时间变化
DOI：
10.1029/97jc02545
复制
发表时间：
1998
影响因子：
--
通讯作者：
S. Griffin
中科院分区：
文献类型：
--
作者：
J. Bauer;E. Druffel;P. Williams;D. Wolgast;S. Griffin
调节深海溶解有机碳（DOC）的稳态库存和停留时间的因素还没有得到很好的确定。以前的研究DOC已被限制到单一的时间点配置文件，提供一般信息的潜在作用，垂直对流扩散过程中控制DOC的分布和平均表观年龄。我们目前的结果从2年的时间序列站在北太平洋东部（站M），短期（月）的变化，库存和Δ 14 C的签名，在深剖面测量DOC与颗粒有机碳（POC）池的变化进行了检查。长期（即，DOC浓度和Δ 14 C值的变化。这些变化在中层（450米和700米）深度尤其明显，接近氧气最低值。在混合层和中层深度，DOC Δ 14 C值与M站的浓度之间存在正相关关系，主要反映了整个主温跃层中“近期”DOC的垂直输入减少。而在深海（≥1600 m），Δ 14 C与DOC浓度呈负相关。在M站，已观察到丰度较低的悬浮和下沉POC池的Δ 14 C特征在季节性时间尺度上波动，推测部分是由于DOC吸附到POC [Drueland et al.，1996年]。然而，Δ 14 C值和相应的大得多的DOC池的浓度似乎没有相关的季节变化，无论是下沉POC通量或悬浮POC丰度。DOC的浓度显着升高，观察站M相比，在中太平洋北部（NCP）在所有地区的水柱除了中层深度，浓度较低，以前被占领的网站。M站各深度DOC的Δ 14 C值均低于NCP站。我们推测，在季节性生产站M和贫营养NCP的DOC池的大小和Δ 14 C的签名的差异导致DOC源和汇之间的差异，以及从DOC和POC之间的相互作用的大小在这些网站。
The factors regulating the steady state inventories and residence times of dissolved organic carbon (DOC) in the deep ocean are not well established. Previous studies of DOC have been limited to single time-point profiles that provide general information on the potential role of vertical advective-diffusive processes in controlling DOC distributions and mean apparent ages. We present results from a 2-year time series station in the eastern North Pacific (station M) where short-term (months) changes in inventories and Δ14C signatures of DOC as measured in deep profiles were examined in conjunction with changes in particulate organic carbon (POC) pools. Significant long-term (i.e., months to years) changes in both DOC concentrations and Δ14C values were observed. These changes were especially evident at mesopelagic (∼450 and 700 m) depths, close to the oxygen minimum. Both within the mixed layer and at mesopelagic depths, positive relationships were found between DOC Δ14C values and concentrations of station M, primarily reflecting diminishing vertical inputs of “recent” DOC throughout the main thermocline. At abyssal depths (≥1600 m), however, Δ14C was inversely correlated with DOC concentration. The Δ14C signature of the less abundant suspended and sinking POC pools has been observed to fluctuate over seasonal timescales at station M, presumably due in part to sorption of DOC to POC [Druffel et al., 1996]. However, the Δ14C values and concentrations of the correspondingly much larger DOC pool do not appear to be related to seasonal changes in either sinking POC fluxes or suspended POC abundances. Significantly elevated concentrations of DOC were observed at station M when compared with a previously occupied site in the north central Pacific (NCP) in all regions of the water column except mesopelagic depths, where concentrations were lower. The corresponding Δ14C values of DOC at all depths at station M were lower than in the NCP. We speculate that dissimilarities in the size and Δ14C signature of the DOC pools at seasonally productive station M and the oligotrophic NCP result from differences in DOC sources and sinks between the two regions, as well as from the magnitude of interaction between DOC and POC at these sites.
影响因子：
8.3
作者：
STUIVER, M;POLACH, HA
通讯作者：
POLACH, HA
影响因子：
64.8
作者：
DRUFFEL, ERM;WILLIAMS, PM
通讯作者：
WILLIAMS, PM