Physical processes causing the formation of hypoxia off the Changjiang estuary after Typhoon Chan-hom, 2015

Guo, Yaru; Rong, Zengrui; Li, Bo; Zhao, Xu; Li, Pixue; Li, Xiaodan

doi:10.1007/s00343-019-7336-5

Cited by 11 publications

(9 citation statements)

References 49 publications

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“…Several observational endeavors, including the cruise in this study, found that a coastal hypoxic zone still persisted despite of the passage of a TC (Su et al, 2017;Wang et al, 2017;Guo et al, 2019;Zhao et al, 2021). The time series data obtained from moorings further revealed the relief and the subsequential reoccurrence of hypoxia off the Changjiang Estuary in response to the passage of the TC (Ni et al, 2016).…”

Section: Introductionsupporting

confidence: 49%

“…Zhao et al (2021) found that although the local respiration rate was the major driver of hypoxia after passage of the TC, the invasion of subsurface water from the outer-shelf with low-oxygen content also contributed an additional 8.6 ± 1.7% of the depletion of DO in the hypoxic zone off the Pearl River Estuary. Guo et al (2019) found that although a TC eye passed through the core hypoxic zone, the stratification at the submerged river valley off the Changjiang Estuary was not completely eliminated and the residual hypoxic water persisted there. The case studies have suggested quite complex and various coupled physical-biogeochemical responses in terms of hypoxia to a passing TC.…”

Section: Introductionmentioning

confidence: 99%

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Response Process of Coastal Hypoxia to a Passing Typhoon in the East China Sea

Meng

Zhou

et al. 2022

Front. Mar. Sci.

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Details of the development of coastal hypoxia in response to the passage of Typhoon Bavi (2020) in the East China Sea were reconstructed by numerical modeling using a three-dimensional coupled physical–biogeochemical model. The model was validated via repeated surveys along a transect across a submerged river valley off the Changjiang Estuary before and after the passage of Typhoon Bavi. Before Bavi’s arrival, survey data indicated that the coastal hypoxia had formed off the Changjiang Estuary. However, the hypoxia was not eliminated but instead migrated and aggravated along the observed transect after the typhoon passage. This phenomenon cannot be attributed to the typhoon-induced mixing. Simulation results reveal that the observed development and spatial migration of hypoxia was mainly controlled by typhoon-induced oceanic advection. Results show that Bavi stimulated a regional quasi-barotropic cyclonic loop circulation and coastal downwelling reversing general summer circulation patterns. The onshore transport of the warmer shelf water and subsequent downwelling resulted in a warming of coastal water. The southward coastal current and downwelling induced by the typhoon also led to a migration of the hypoxic zone. Meanwhile, a massive transport of resuspended planktonic detritus from the steep inner shelf and the shallow Changjiang bank toward the submerged river valley occurred. This study reveals that the typhoon-driven currents can play an important role in the development of hypoxia and redistribution of deposited organic matter in coastal shelf seas, which may have both short- and long-term effects on the regional marine biogeochemical environment.

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Section: Introductionsupporting

confidence: 49%

Section: Introductionmentioning

confidence: 99%

Response Process of Coastal Hypoxia to a Passing Typhoon in the East China Sea

Meng

Zhou

et al. 2022

Front. Mar. Sci.

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“…ROMS is a hydrostatic, primitive equation oceanic model that implements a free surface, horizontal curvilinear coordinate and a terrain-following vertical coordinate system (Haidvogel et al 2000;Peliz et al 2003;Budgell 2005). In our recent works, this model was successfully utilized to explore the response of coastal regions to the atmospheric forcing (e.g., Guo et al 2019). The model is configured to a sector-shaped domain covering most of the SEIO region bordered by the Western Australian coast to the east and Java to the north (Fig.…”

Section: B Model Configurationsmentioning

confidence: 99%

Processes Controlling Sea Surface Temperature Variability of Ningaloo Niño

Guo

Wang

et al. 2020

Journal of Climate

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A high-resolution (3-8 km) regional oceanic general circulation model is utilized to understand the sea surface temperature (SST) variability of Ningaloo Niño in the southeast Indian Ocean (SEIO). The model reproduces eight Ningaloo Niño events with good fidelity and reveals complicated spatial structures. Mesoscale noises are seen in the warming signature and confirmed by satellite microwave SST data. Model experiments are carried out to quantitatively evaluate the effects of key processes. The results reveal that the surface turbulent heat flux (primarily latent heat flux) is the most important process (contribution . 68%) in driving and damping the SST warming for most events, while the roles of the Indonesian Throughflow (;15%) and local wind forcing are secondary. A suitable air temperature warming is essential to reproducing the reduced surface latent heat loss during the growth of SST warming (;66%), whereas the effect of the increased air humidity is negligibly small (1%). The established SST warming in the mature phase causes increased latent heat loss that initiates the decay of warming. A 20-member ensemble simulation is performed for the 2010/11 super Ningaloo Niño, which confirms the strong influence of ocean internal processes in the redistribution of SST warming signatures. Oceanic eddies can dramatically modulate the magnitudes of local SST warming, particularly in offshore areas where the ''signal-to-noise'' ratio is low, raising a caution for evaluating the predictability of Ningaloo Niño and its environmental consequences.

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“…The fate of the river plume can be separated into two regions and processes: the circulating bulge near the river mouth and the downstream coastal current (Fong and Geyer, 2002;Horner-Devine, 2009). It has been estimated that about 80 %-90 % of the river discharge is transported alongshore with the coastal current (Li and Rong, 2012;Wu et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Wind-driven stratification patterns and dissolved oxygen depletion off the Changjiang (Yangtze) Estuary

Liblik

Fan

et al. 2020

Biogeosciences

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Abstract. Multiple factors have been accused of triggering coastal hypoxia off the Changjiang Estuary, and their interactions lead to high yearly variation in hypoxia development time window and distribution extent. Two oceanographic cruises, conducted in July 2015 and August–September 2017, were complemented by river discharge, circulation simulation, remotely sensed wind, salinity and sea level anomaly data to study the dissolved oxygen (DO) depletion off the Changjiang Estuary from synoptic to interannual timescales. Intensification of the Chinese Coastal Current and Changjiang Diluted Water (CDW) spreading to the south together with coastal downwelling caused by the northerly wind was observed in the summer of 2015. This physical forcing led to a well-ventilated area in the north and a hypoxic area of 1.3×104 km2 in the south, while in 2017 the summer monsoon (southerly winds) induced offshore transport in the surface layer that caused a subsurface intrusion of Kuroshio-derived water to the shallower areas (<10 m depth) in the north and upwelling in the south. Wind-driven Ekman surface flow and reversal of the geostrophic current related to the upwelling compelled alteration of the Chinese Coastal Current. Consequently, intense hypoxia (DO down to 0.6 mg L−1) starting from 4 to 8 m depth connected to CDW and deep water intrusion in the north and coastal hypoxia linked to the upwelling in the south were observed in 2017. Distinct situations of stratification and DO distributions can be explained by wind forcing and concurrent features in surface and deep layer circulation, upwelling and downwelling events. Enhanced primary production in the upper layer of the CDW or the upwelled water determines the location and extent of DO depletion. Likewise, the pycnocline created by Kuroshio subsurface water intrusion is an essential precondition for hypoxia formation. Wind forcing largely controls the interannual change of hypoxic area location and extent. If the summer monsoon prevails, extensive hypoxia more likely occurs in the north. Hypoxia in the south occurs if the summer monsoon is considerably weaker than the long-term mean.

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Physical processes causing the formation of hypoxia off the Changjiang estuary after Typhoon Chan-hom, 2015

Cited by 11 publications

References 49 publications

Response Process of Coastal Hypoxia to a Passing Typhoon in the East China Sea

Response Process of Coastal Hypoxia to a Passing Typhoon in the East China Sea

Processes Controlling Sea Surface Temperature Variability of Ningaloo Niño

Wind-driven stratification patterns and dissolved oxygen depletion off the Changjiang (Yangtze) Estuary

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