The Reversal Indian Ocean Waters

Liang, Long; Xue, Huijie

doi:10.1029/2020gl088269

Cited by 10 publications

(9 citation statements)

References 36 publications

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“…To follow the evolution of the air masses of the hot events backwards in time, we employ the Lagrangian trajectory model TRACMASS v7.0 (Aldama-Campino et al, 2020;Döös, 1995), which can be applied to study the atmospheric or oceanic circulation (e.g., Dey & Döös, 2020;Liang & Xue, 2020). TRACMASS represents reanalysis or General Circulation Model (GCM) winds as 3D mass transports between grid boxes by solving the continuity equation.…”

Section: Tracking Air Back In Time With Tracmass-era5mentioning

confidence: 99%

Drivers and Mechanisms of the 2021 Pacific Northwest Heatwave

2022

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In late June 2021, western North America, and in particular the Pacific Northwest experienced a heatwave with temperatures usually only encountered in hot desert climates. Using a blend of reanalysis data and Earth System Model (ESM) simulations, we disentangle the physical drivers underlying this exceptional event. Our analysis highlights the role of the anticyclonic circulation aloft, which converted previously gained potential energy—some of which by intense latent heating thousands of kilometers upwind over the North Pacific—back into sensible heat through subsidence. We demonstrate that this upwind latent heat release did not only result in a hot troposphere above the heatwave region, but also contributed directly to escalating near‐surface temperatures. Facilitated by the mountainous terrain and dry soils in the region, deep atmospheric boundary layers were established over the course of several days, connecting the air close to Earth's surface to a massive heat reservoir many kilometers above. Anomalous soil moisture acted to raise the heatwave temperatures by 3°C in a large region during the peak of the event, with local anomalies exceeding 5°C. Overall, we conclude that this heatwave was the outcome of an intricate interplay between dynamic and thermodynamic processes. ESM experiments suggest that the same large‐scale atmospheric circulation fueled by enhanced thermodynamic drivers, such as more available moisture for condensation upwind, could enable even more extreme near‐surface temperatures, in particular in a warmer climate.

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Section: Tracking Air Back In Time With Tracmass-era5mentioning

confidence: 99%

Drivers and Mechanisms of the 2021 Pacific Northwest Heatwave

2022

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“…Observation of NIIW recirculation within the Savu Sea and its possible intrusion into Banda Sea via the northern and eastern portal of the Ombai Strait are still a challenge. However, recent model study suggested that a reversal throughflow via Ombai Strait brings Indian intermediate water into interior seas and farther into the western tropical Pacific Ocean(Liang et al, 2020).4. CONCLUSIONSThe INDOMIX cruise, carried out in July 2010, provides a unique dataset to document water masses and currents along the track from the edge of the Pacific Ocean to the Halmahera entry portal to the southern Lesser Sunda Arc, successively crossing the Seram Sea, Manipa Strait, Banda Sea, Ombai Strait, northern Savu Sea, Sumba Strait, and south of Lombok Strait.…”

mentioning

confidence: 99%

Part I: Hydrological properties within the eastern Indonesian throughflow region during the INDOMIX experiment

Atmadipoera

Koch-Larrouy

Madec

et al. 2022

Deep Sea Research Part I: Oceanographic Research Papers

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“…Nested within a large‐region physical model, the small‐region physical model off the southern coast of Java Island resembles the seasonal cycle of depth‐integrated transport from the surface to 300 m through the Lombok section revealed by INSTANT data (Sprintall et al., 2009), which peaks at ∼4 Sv from July to September and decreases to a minimum of ∼2 Sv in December and January in concert with monsoons and transitions (Liang & Xue, 2020). Well‐characterized ITF transport through the Lombok section plays an important role in modeling the circulation and nutrient transport off the southern coast of Java Island (see more details in Section 6).…”

Section: Comparison Of the General Characteristics Between The Model ...mentioning

confidence: 99%

A Biological‐Parameter‐Optimized Modeling Study of Physical Drivers Controlling Seasonal Chlorophyll Blooms off the Southern Coast of Java Island

Gao

Yang

et al. 2022

JGR Oceans

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A physical‐biogeochemical model consists of many key parameters; theoretically, 10,000 or more numerical experiments are required to obtain a set of optimal biological parameters. The corresponding computing resources are too expensive when running a three‐dimensional and high‐resolution physical‐biogeochemical model. In this study, we improve the performance of a three‐dimensional physical‐biogeochemical model via the conditional nonlinear optimal perturbation method for southern Java Island, where chlorophyll blooms occur seasonally. Based on the improved model results, we calculated the mixed‐layer nutrient budget, thereby characterizing how each physical process transports nutrients into the surface oligotrophic layer and then stimulates the chlorophyll blooms during the southeast monsoon season. Nutrients that upwell along the submarine slope are found in narrow regions along the coast and spread into most of the study area by local wind‐induced offshore transport. The contribution of nonlinearity (advection) is essential to modulating the upslope movement of nutrients off the coast. If local winds are neglected in the model, onshore transport induced by the pressure gradient force in the zonal direction (alongshore) and subsequent downwelling would be dominant, and chlorophyll blooms would diminish in most regions. The role of the South Java Coastal Current varies under the joint influence of remote and local wind forcings. The Indonesian Throughflow from the Lombok Strait also contributes to surface phytoplankton growth along its path off the south of Java Island.

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The Reversal Indian Ocean Waters

Cited by 10 publications

References 36 publications

Drivers and Mechanisms of the 2021 Pacific Northwest Heatwave

Drivers and Mechanisms of the 2021 Pacific Northwest Heatwave

Part I: Hydrological properties within the eastern Indonesian throughflow region during the INDOMIX experiment

A Biological‐Parameter‐Optimized Modeling Study of Physical Drivers Controlling Seasonal Chlorophyll Blooms off the Southern Coast of Java Island

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