首页|The spatial hydrological structure of the western tropical Pacific derived from delta O-18 and delta D signatures

The spatial hydrological structure of the western tropical Pacific derived from delta O-18 and delta D signatures

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  • NSTL
  • Elsevier
Lack the connection between the air-sea interaction and deep hydrological processes hinders to clarify the response of Western Pacific warm pool (WPWP) to recent global warming. In this paper, delta O-18, delta D, combined with other properties of seawater collecting during the 37th and 47th Chinese Research Expedition cruises, were measured to trace the potential hydrological processes in the tropical Pacific Ocean. The change in delta O-18 and dexcess signatures of surface water revealed that two different zones were separated at 155 degrees E along the transect. This coincided with the spatial evaporation-precipitation pattern of the Pacific Walker circulation (PWC). At station CTD03, O-18-enriched water (salinity similar to 35 psu, delta O-18 similar to 0.20 parts per thousand in average) at a depth of 100 similar to 150 m was potentially attributed to the recirculation of the Kuroshio Extension Flow (KEF). In contrast, the deep water with low delta O-18 (- 0.60 parts per thousand in average from 2000 m to 5680 m) indicated the dominant Lower Circumpolar Pacific Water (LCPW). These contributions of water mass sources to the hydrological structure of western Pacific warm pool (WPWP) were confirmed by a mass balance model. Furthermore, significant linear correlations between chlorophyll and delta O-18, as well as chlorophyll and d-excess within the upper 200 m at station CTD03, indicated that the seawater delta O-18 signature could be impacted by biogenic fractionation. The research highlights the validity of delta O-18 and d-excess to indicate both hydrological processes and watermass structure in WPWP. Further proofs based on investigation and experiments are required.

Stable isotopesHydrological structureWestern Pacific Warm PoolWater massesPacific Walker circulationBiogenic processesSOUTHERN INDIAN-OCEANWALKER CIRCULATIONWATER MASSESISOTOPE FRACTIONATIONOXYGEN ISOTOPESSTABLE-ISOTOPESBOTTOM WATERSHYDROGENDEEPSEA

Yang, Juan、Han, Luwei、Sun, Dong、Xing, Zhaohui

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China Univ Geosci

Minist Nat Resources

2022

10.1016/j.jhydrol.2022.127537

Journal of Hydrology

Journal of Hydrology

EISCI
ISSN：0022-1694
年,卷(期)：2022.607
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