Abstract A composite time series of the merged satellite altimeters sea surface height anomaly (SSHA) data and satellite‐observed temperature (SST) were used to identify eddies in Western North Pacific Ocean (WNPO), where there numbers intense typhoons. This study systematically investigated 15 super typhoons during period 2000‐2008 WNPO their impacts on pre‐typhoon ocean features, e.g., cyclonic eddy (COE) feature (closed contours SSHA < −6 cm) neutral condition (SSHA between 6 cm). Two...

Abstract The responses of the cyclonic eddies (CEs) and anticyclonic (AEs) to typhoon forcing in Western North Pacific Ocean (WNPO) are analyzed using Argo profiles. Both CEs AEs have primary cooling at surface (0–10 m depth) deep upwelling from top thermocline (200 down deeper ocean shortly after forcing. Due upwelling, part warm fresh water move out eddy, which leads a colder saltier subsurface passage typhoon. In contrast, inflow heats freshens compensate induced by This explains why...

Within a simple model context, the sensitivity and stability of thermohaline circulation to finite-amplitude perturbations are studied. A new approach is used tackle this nonlinear problem. The method based on computation so-called conditional optimal perturbation (CNOP), which generalization linear singular vector (LSV). It shown that linearly stable states can become nonlinearly unstable, properties with growth determined. An asymmetric response exists respect sign freshwater...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 404:39-50 (2010) - DOI: https://doi.org/10.3354/meps08477 Strong enhancement of chlorophyll a concentration by weak typhoon Liang Sun1,2,*, Yuan-Jian Yang3, Tao Xian1, Zhu-min Lu4, Yun-Fei Fu1 1Laboratory Atmospheric Observation and Climatological Environment, School Earth Space Sciences, University Science...

Abstract. The Genealogical Evolution Model (GEM) presented here is an efficient logical model used to track dynamic evolution of mesoscale eddies in the ocean. It can distinguish between different processes (e.g., merging and splitting) within a pattern, which difficult accomplish using other tracking methods. To this end, GEM first uses two-dimensional (2-D) similarity vector (i.e., pair ratios overlap area two each eddy) rather than scalar measure eddies, effectively solves “missing eddy”...

The gas flow field significantly impacts the output power of proton exchange membrane fuel cells (PEMFCs). A nonuniform design is developed in this study to optimize arrangement blocks field, thereby enhancing PEMFC power. Numerical simulations indicate block arrangements mass transfer performance compared uniform arrangements. Under 0.4 V working voltage, new has increased density by 4.84%. with three positioned near outlet effectively leverages entrance effect and disrupts thicker boundary...

AbstractA new mononuclear eddy identification method based on sea level anomaly (SLA) data was developed and described in this study. To solve the multinuclear problem, we employed two strategies to split eddies into individual eddies: closest angle distance strategies. Each strategy produces an with only one SLA extremum. The splitting procedure is these No artificial threshold needed strategies, but a for choice required. are adaptable various methods. examples indicate that clearly...

Argo salinity and temperature profiles, along with other sea surface measurements, were used to explore the impacts of Typhoon Namtheun (2004) on ocean. took local enthalpy heat from (0.39–0.7 × 108 J m−2), cooled water as a result vertical mixing (maximum 3–4°C) produced heavy precipitation over (100–180 mm). During this time, vast latent released (2.6–4.4 m−2) by made larger contribution typhoon's energy budget than air-sea flux. In upper ocean, oceanic responses can be separated into two...

Abstract In this study the influence of cell tilting on flow dynamics and heat transport is explored experimentally within a rectangular (aspect ratios ${\it\Gamma}_{x}=1$ ${\it\Gamma}_{y}=0.25$ ). The measurements are carried out over wide range tilt angles ( $0\leqslant {\it\beta}\leqslant {\rm\pi}/2\ \text{rad}$ ) at constant Prandtl number $\mathit{Pr}\simeq 6.3$ Rayleigh $\mathit{Ra}\simeq 4.42\times 10^{9}$ velocity reveal that large-scale circulation (LSC) sensitive to symmetry...

We introduce a novel method to accurately evaluate the satellite-observed sea surface temperature (SST) cooling induced by typhoons with complex tracks, which is widely used but only roughly calculated in previous studies. This first records typhoon forcing period and SST response grid grid, then evaluates each choosing maximum decrease within this time period. grid-based flexible date can typhoon-induced its corresponding as indicated applying irregular track of Typhoon Lupit (2009) three...

The extraction of physical information about the subsurface ocean from surface obtained satellite measurements is both important and challenging. We introduce a back-propagation neural network (BPNN) method to determine temperature North Pacific Ocean by selecting optimum input combination sea parameters measurements. In addition height (SSH), (SST), salinity (SSS) wind (SSW), we also included velocity (SSV) as new component in our study. This allowed us partially resolve non-linear dynamics...

The ocean surface and subsurface biophysical responses their feedbacks to super typhoon Nida were comprehensively investigated based on a substantial dataset of multiple-satellite observations, Argo profiles, reanalysis data. experienced two Category 5 stages: rapid intensification stage that was fast moving along straight-line track, weakening slowly sharp-left sudden-turning track. During the stage, caused an average sea temperature (SST) cooling 1.44 °C chlorophyll-a (chl-a) concentration...

The decadal variation of thermohaline circulation (THC) is investigated in a simple coupled ocean‐atmospheric two‐box model with the new approach conditional nonlinear optimal perturbation (CNOP). First, initial perturbations different constrains are found by this approach. There two types regime. One freshwater flux perturbation, which CNOP THC and has stronger amplification. other salinity whose amplification weaker. Freshwater (salt) weaken (enhance) mean hence stability THC. Second,...

A new algorithm is proposed for retrieving atmospheric columnar water vapor (CWV) over ocean in the absence of rain by using Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) measurements. Applying a log linear relationship between brightness temperatures and main environmental variables including CWV, sea surface temperature, wind speed, cloud liquid path, this five‐channel‐based was developed through radiative transfer model simulations. The unique advantage that retrieved...

The responses of the upper ocean to typhoon Namtheun in July 2004 are investigated by sea surface measurements and vertical profiles. Pre-typhoon environment played an important role this case. There were two extreme cooling regions located at cyclonic eddy A wake B. Although magnitudes SST B similar, other physical biophysical quite different. Combining multi-satellite data with profile data, it is found that upwelling dominated mixing This study implies insight into typhoon, subsurface...

Using multiple satellite observations, Argo floats profiles, and one-dimensional (1-D) ocean mixed layer model, this study systematically investigated the impacts of binary typhoons Hagibis Mitag [which coexisted respectively in South China Sea (SCS) western North Pacific (WNP) during November, 22 to 26, 2007] on upper environments. It was observed that intense Ekman pumping two mesoscale cold, cyclonic eddies, which, induced by long forcing time strong wind stress curls, appeared certain...

Abstract Many studies have reported on the trends of precipitation in Mid-Eastern China (EC). However, convective and stratiform are still unknown. Here, we examine summer EC from 2002 to 2012 basis TRMM observations. Results revealed that rain frequency (RF) for both increased majority regions Southern (SEC), but decreased Northwest part Northern (NEC). The decreasing rate RF NEC is twice as much precipitation, while increase SEC more evident than precipitation. (RR) exhibited a trend most...

Abstract. The long-term theoretical “energy paradox” of whether the final state two merging anticyclones contains more energy than initial is studied by considering typical events ocean mesoscale eddies. results demonstrate that total mass (volume), circulation (area integration vorticity), and angular momentum (AM) are conserved if orbital AM relative to center taken into account as eddies rotate around before merging. For subsurface merging, trapped Taylor–Proudman effect above should also...

The physical and biological environments of the northeast South China Sea (SCS) were investigated using 11 year satellite reanalysis data, including ocean chlorophyll-a (Chl-a) concentrations, sea surface wind (SSW) values, temperatures (SSTs), height anomalies (SSHAs), etc. findings reveal that Chl-a concentrations west Luzon Strait have most significant annual cycles in SCS. dominant forcing mechanisms are monsoon winds mesoscale eddies studied by multiple regression analysis. In offshore...

With the strong support of Chinese government, Beibu Gulf Urban Agglomeration has responded positively to national call vigorously develop marine economy. However, a series resource and environmental problems such as over-exploitation resources excessive discharge pollutants in also arisen along with rapid development economy, limiting space for economy Agglomeration. Based on panel data seven coastal cities urban agglomeration from 2011-2021, DPSIR model was used construct carrying capacity...

AbstractClimatological mean and annual variations of Chlorophyll-a (Chl-a) distribution, sea surface wind (SSW), temperature (SST) from 1998 to 2008 were analyzed in the middle South China Sea (SCS), focusing on typical region off east coast Vietnam (8.5-14°XN, 109.5-114°XE). Based remote sensing data SCS summer monsoon index (SCSSMI) data, high Chl-a concentrations southwest season (June-September) may be related strong Ekman pumping strongwind stress. The maximum monthly averaged...