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Article ; Online: The influence of cold filaments on the evolution of dipole structures

Qi Yang / Guihua Wang / Chi Xu / Guoping Gao / Ruili Sun

Frontiers in Marine Science, Vol

2023 Volume 10

Abstract: Mesoscale eddy dipoles are oceanographic structures that can transport ocean water parcels horizontally and vertically in ways that differ from individual mesoscale eddies. The most conspicuous additional feature that presents in dipoles is the cold ... ...

Abstract	Mesoscale eddy dipoles are oceanographic structures that can transport ocean water parcels horizontally and vertically in ways that differ from individual mesoscale eddies. The most conspicuous additional feature that presents in dipoles is the cold filament (CF) that can be spontaneously generated between a dipole’s anticyclonic eddy (AE) and cyclonic eddy (CE). A case study in this paper shows that the interaction between the CF and the CE component of the dipole is associated with the structural evolution of the dipole. This interaction is verified in synthesis and normalization studies of the CF dipoles. The CF-dipole interaction entrains CF water into the center of the dipole’ CE and leads to a cold and high chlorophyll center in the upper layer of the CE. The formation of this cold center changes the dipole’s structure by eliminating the phase difference between the thermal and dynamic centers of the dipole. The entrainment also provides a new mechanism for the development of high chlorophyll levels in the CE. In the analysis of the HYCOM (Hybrid Coordinate Ocean Model) simulation of a synthetic CF dipole, the AE has a three-zone structure while the CE only has two. The convergence of the CE’s outermost zone results in a biased interaction.
Keywords	filament ; mesoscale eddy dipole ; interaction ; structure ; Lagrangian trajectory ; chlorophyll ; Science ; Q ; General. Including nature conservation ; geographical distribution ; QH1-199.5
Subject code	551
Language	English
Publishing date	2023-06-01T00:00:00Z
Publisher	Frontiers Media S.A.
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Risk Reasoning from Factor Correlation of Maritime Traffic under Arctic Sea Ice Status Association with a Bayesian Belief Network

Zhuang Li / Shenping Hu / Guoping Gao / Yongtao Xi / Shanshan Fu / Chenyang Yao

Sustainability, Vol 13, Iss 147, p

2021 Volume 147

Abstract: Sustainable growth should not only be beneficial to the shipping industry in the future, but is also an urgent need to respond to resource and environmental crises and strengthen shipping governance. Maritime traffic in Arctic waters is prone to ... ...

Abstract	Sustainable growth should not only be beneficial to the shipping industry in the future, but is also an urgent need to respond to resource and environmental crises and strengthen shipping governance. Maritime traffic in Arctic waters is prone to encounter dangerous ice conditions, and it is essential to study the mechanism of ice collision risk formation in relation to ice conditions. Taking the ship-ice collision risk in Arctic waters as the research object, we propose a dynamic assessment model of ship-ice collision risk under sea ice status dynamic association (SDA) effect. By constructing the standard paradigm of risk factor dynamic association (DA) effect, taking SDA as the key association factor. Combing with other risk factors that affect ship-ice collision accidents, the coupling relationship between risk factors were analyzed. Then, using the Bayesian network method to build a ship-ice collision accident dynamic risk assessment model and combing with the ice monitoring data in summer Arctic waters, we screen five ships’ position information on the trans-Arctic route in August. The risk behavior of ship-ice collision accidents on the selected route under SDA is analyzed by model simulation. The research reveal that the degree of SDA is a key related factor for the serious ice condition and the possibility of human error during ship’s navigation, which significantly affects the ship-ice collision risk. The traffic in Arctic waters requires extra vigilance of the SDA effect from no ice threat to ice threat, and continuous ice threat. According to the ship-ice collision risk analysis under the SDA effect and without SDA effect, the difference in risk reasoning results on the five stations of the selected route are 32.69%, −32.33%, −27.64%, −10.26%, and −30.13% respectively. The DA effect can optimize ship-ice collision risk inference problem in Arctic waters.
Keywords	maritime traffic risk ; ship-ice collision ; Bayesian network ; Dempster-Shafer theory ; Arctic waters ; dynamic association ; Environmental effects of industries and plants ; TD194-195 ; Renewable energy sources ; TJ807-830 ; Environmental sciences ; GE1-350
Subject code	290
Language	English
Publishing date	2021-12-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Cloud mask-related differential linear adjustment model for MODIS infrared water vapor product

Chang, Liang / Ruya Xiao / Abhnil Amtesh Prasad / Guoping Gao / Guiping Feng / Yu Zhang

Remote sensing of environment. 2019 Feb., v. 221

2019

Abstract: Water vapor is the primary greenhouse gas of the Earth-atmosphere system and plays a vital role in understanding climate change, if correctly measured from satellites. The Moderate Resolution Imaging Spectroradiometer (MODIS) can monitor water vapor ... ...

Abstract	Water vapor is the primary greenhouse gas of the Earth-atmosphere system and plays a vital role in understanding climate change, if correctly measured from satellites. The Moderate Resolution Imaging Spectroradiometer (MODIS) can monitor water vapor retrievals at near-infrared (nIR) bands in the daytime as well as at infrared (IR) bands in both daytime and night time. However, the accuracy of IR retrievals under confident clear conditions (>99% probability) is much poorer than that of nIR retrievals. Additionally, IR retrievals under unconfident clear conditions (>95%, >66% and ≤66% probabilities) are usually discarded because the possible presence of clouds would further reduce their accuracy. In this study, we develop a cloud mask-related differential linear adjustment model (CDLAM) to adjust IR retrievals under all confident clear conditions. The CDLAM-adjusted IR retrievals are evaluated with the linear least square (LS) adjusted nIR retrievals under confident clear condition and Global Positioning System (GPS) observations under different probabilities of clear conditions. Both case studies in the USA and global (65° S~65° N) evaluation reveal that the CDLAM can significantly reduce uncertainties in IR retrievals at all clear-sky confidence levels. Moreover, the accuracy of the CDLAM-adjusted IR retrievals under unconfident clear conditions is much better than IR retrievals without adjustment under confident clear conditions, highlighting the effectiveness of the CDLAM in enhancing the accuracy of IR retrievals at all clear-sky confidence levels as well as the data availability improvement of IR retrievals after adjustment with the CDLAM (14% during the analyzed time periods). The most likely reason for the efficiency of the CDLAM may be that the deviation of the differential water vapor information derived by the differential process is significantly shrunken after the linear regression analysis in the presented model. Therefore, the CDLAM is a promising tool for effectively adjusting IR retrievals under all probabilities of clear conditions and can improve our knowledge of the water vapor distribution and variation.
Keywords	case studies ; climate change ; global positioning systems ; greenhouse gases ; models ; moderate resolution imaging spectroradiometer ; regression analysis ; remote sensing ; satellites ; uncertainty ; water vapor ; United States
Language	English
Dates of publication	2019-02
Size	p. 650-664.
Publishing place	Elsevier Inc.
Document type	Article
ZDB-ID	431483-9
ISSN	0034-4257
ISSN	0034-4257
DOI	10.1016/j.rse.2018.12.005
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Surface Air Temperature Evaluation from GPS Radio Occultation in Turbulent Heat Flux Estimation

Liang Chang / Guoping Gao / Lixin Guo / Guiping Feng / Yang Zhang

Terrestrial, Atmospheric and Oceanic Sciences, Vol 27, Iss 2, Pp 303-

Case Study in Tropical Oceans

2016 Volume 309

Abstract: Surface air temperature (SAT) retrieval at 2 m using Global Positioning System (GPS) radio occultation (RO) observations is presented in this paper. These measurements were further incorporated to estimate turbulent heat fluxes. The results show that the ...

Abstract	Surface air temperature (SAT) retrieval at 2 m using Global Positioning System (GPS) radio occultation (RO) observations is presented in this paper. These measurements were further incorporated to estimate turbulent heat fluxes. The results show that the root mean square (RMS) of RO derived SAT (SATRO) is better than 1.1°C and the standard deviation (STD) is less than 0.9°C. Furthermore, the turbulent heat fluxes derived from RO observations show smaller deviations from the Tropical moored buoys than the other gridded products analyzed in this study, revealing that the SATRO is helpful in improving surface turbulent heat flux estimation.
Keywords	GPS radio occultation ; Surface air temperature ; Turbulent heat flux ; Geography (General) ; G1-922 ; Geology ; QE1-996.5
Language	English
Publishing date	2016-04-01T00:00:00Z
Publisher	Chinese Geoscience Union
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Endohedral metallofullerenes (M@C60) as efficient catalysts for highly active hydrogen evolution reaction

He, Tianwei / Aijun Du / Geoffrey Will / Guoping Gao / Liangzhi Kou

Journal of catalysis. 2017 Oct., v. 354

2017

Abstract: The cage structure of C60 fullerenes with encapsulated metal atoms, i.e. endohedral fullerenes (M@C60) possess unique electronic properties with novel applications. By using density functional theory (DFT), we for the first time predict endohedral M@C60 ( ...

Abstract	The cage structure of C60 fullerenes with encapsulated metal atoms, i.e. endohedral fullerenes (M@C60) possess unique electronic properties with novel applications. By using density functional theory (DFT), we for the first time predict endohedral M@C60 (M=Na, K, Rb, Cs, Sc, Ti, Mn, Fe) fullerenes from 20 possible candidates as promising high performance hydrogen evolution reaction (HER) catalysts. For the pristine C60, the Gibbs free energy is too positive to prevent the adsorption of H-atoms on surface carbon atoms. However, when a metal atom is embedded in the C60 cage, the H-atom binding free energy on M@C60 can be optimized to ideal value for HER (ΔGH=0). The catalytic active site is non-metal C-atom and the HER performance of M@C60 are even better than those of the state-of-the-art Pt and MoS2 catalysts. The excellent catalytic activities are attributed to the charge transfer between the metal atom and C60 cage. Since the endohedral fullerenes can be easily realized in experiment, our findings highlight a new class of low-cost and efficient HER catalyst for experimental validation studies toward hydrogen production.
Keywords	adsorption ; catalysts ; catalytic activity ; density functional theory ; encapsulation ; fullerene ; Gibbs free energy ; hydrogen production ; iron ; manganese ; molybdenum disulfide ; potassium ; rubidium
Language	English
Dates of publication	2017-10
Size	p. 231-235.
Publishing place	Elsevier Inc.
Document type	Article
ZDB-ID	1468993-5
ISSN	0021-9517
ISSN	0021-9517
DOI	10.1016/j.jcat.2017.08.025
Database	NAL-Catalogue (AGRICOLA)

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Article: Boosting oxygen reduction and hydrogen evolution at the edge sites of a web-like carbon nanotube-graphene hybrid

Odedairo, Taiwo / Aijun Du / Guoping Gao / Xiangdong Yao / Xuecheng Yan / Zhonghua Zhu

Carbon. 2016 Oct., v. 107

2016

Abstract: Identifying catalytically active sites in graphene-based catalysts is critical to improved oxygen reduction reaction (ORR) electrocatalysts for fuel-cell applications. To generate abundant active edge sites on graphene-based electrocatalysts for superior ...

Abstract	Identifying catalytically active sites in graphene-based catalysts is critical to improved oxygen reduction reaction (ORR) electrocatalysts for fuel-cell applications. To generate abundant active edge sites on graphene-based electrocatalysts for superior electrocatalytic activity, rather than at their basal plane, has been a challenge. A new type of ORR electrocatalyst produced using fluidization process and based on a three-dimensional hybrid consisting of horizontally-aligned carbon nanotube and graphene (CNT-G), featured abundant active edge sites and a large specific surface area (863Â m2Â gâ1). The Pt-doped CNT-G exhibited an increase of about 55% in mass activity over the state-of-the-art commercial Pt/C and about 164% over Pt/N-graphene in acidic medium, and approximately 54% increase in kinetic limiting current than the Pt/C at low overpotential in alkaline medium. The higher mass activity indicates that less Pt is required for the same performance, reducing the cost of fuel cell electrocatalyst. In hydrogen evolution reaction (HER), both the metal-free CNT-G and Pt/CNT-G exhibited superior electrocatalytic activity compared to N-doped graphene and commercial Pt/C, respectively.
Keywords	active sites ; carbon nanotubes ; catalysts ; fuel cells ; graphene ; hydrogen production ; oxygen ; surface area
Language	English
Dates of publication	2016-10
Size	p. 739-746.
Publishing place	Elsevier Ltd
Document type	Article
ISSN	0008-6223
DOI	10.1016/j.carbon.2016.06.080
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: A multi-modal open dataset for mental-disorder analysis

Hanshu Cai / Zhenqin Yuan / Yiwen Gao / Shuting Sun / Na Li / Fuze Tian / Han Xiao / Jianxiu Li / Zhengwu Yang / Xiaowei Li / Qinglin Zhao / Zhenyu Liu / Zhijun Yao / Minqiang Yang / Hong Peng / Jing Zhu / Xiaowei Zhang / Guoping Gao / Fang Zheng /

Rui Li / Zhihua Guo / Rong Ma / Jing Yang / Lan Zhang / Xiping Hu / Yumin Li / Bin Hu

Scientific Data, Vol 9, Iss 1, Pp 1-

2022 Volume 10

Abstract: Measurement(s) Human Brainwave • spoken language Technology Type(s) EEG collector • audio recorder Sample Characteristic - Organism Homo Sapiens Sample Characteristic - Location ... ...

Abstract	Measurement(s) Human Brainwave • spoken language Technology Type(s) EEG collector • audio recorder Sample Characteristic - Organism Homo Sapiens Sample Characteristic - Location China
Keywords	Science ; Q
Language	English
Publishing date	2022-04-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Calculations of helium separation via uniform pores of stanene-based membranes

Guoping Gao / Yan Jiao / Yalong Jiao / Fengxian Ma / Liangzhi Kou / Aijun Du

Beilstein Journal of Nanotechnology, Vol 6, Iss 1, Pp 2470-

2015 Volume 2476

Abstract: The development of low energy cost membranes to separate He from noble gas mixtures is highly desired. In this work, we studied He purification using recently experimentally realized, two-dimensional stanene (2D Sn) and decorated 2D Sn (SnH and SnF) ... ...

Abstract	The development of low energy cost membranes to separate He from noble gas mixtures is highly desired. In this work, we studied He purification using recently experimentally realized, two-dimensional stanene (2D Sn) and decorated 2D Sn (SnH and SnF) honeycomb lattices by density functional theory calculations. To increase the permeability of noble gases through pristine 2D Sn at room temperature (298 K), two practical strategies (i.e., the application of strain and functionalization) are proposed. With their high concentration of large pores, 2D Sn-based membrane materials demonstrate excellent helium purification and can serve as a superior membrane over traditionally used, porous materials. In addition, the separation performance of these 2D Sn-based membrane materials can be significantly tuned by application of strain to optimize the He purification properties by taking both diffusion and selectivity into account. Our results are the first calculations of He separation in a defect-free honeycomb lattice, highlighting new interesting materials for helium separation for future experimental validation.
Keywords	fluorination ; gas purification ; honeycomb lattice ; Technology ; T ; Chemical technology ; TP1-1185 ; Science ; Q ; Physics ; QC1-999
Subject code	660
Language	English
Publishing date	2015-12-01T00:00:00Z
Publisher	Beilstein-Institut
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Ti3C2 MXene co-catalyst on metal sulfide photo-absorbers for enhanced visible-light photocatalytic hydrogen production

Jingrun Ran / Guoping Gao / Fa-Tang Li / Tian-Yi Ma / Aijun Du / Shi-Zhang Qiao

Nature Communications, Vol 8, Iss 1, Pp 1-

2017 Volume 10

Abstract: Solar hydrogen production through photocatalytic water splitting requires active and stable co-catalysts to replace platinum. Here, the authors use DFT to identify Ti3C2nanoparticles as potential co-catalysts, and assess their photocatalytic hydrogen ... ...

Abstract	Solar hydrogen production through photocatalytic water splitting requires active and stable co-catalysts to replace platinum. Here, the authors use DFT to identify Ti3C2nanoparticles as potential co-catalysts, and assess their photocatalytic hydrogen production activity.
Keywords	Science ; Q
Language	English
Publishing date	2017-01-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Polycyclic aromatic hydrocarbons in ocean sediments from the North Pacific to the Arctic Ocean

Ma, Yuxin / Crispin J. Halsall / Danijela Koetke / Guoping Gao / Ralf Ebinghaus / Wenying Mi / Zhiyong Xie

Environmental pollution. 2017,

2017

Abstract: Eighteen polycyclic aromatic hydrocarbons (PAHs) were measured in surficial sediments along a marine transect from the North Pacific into the Arctic Ocean. The highest average Î£18PAHs concentrations were observed along the continental slope of the ... ...

Abstract	Eighteen polycyclic aromatic hydrocarbons (PAHs) were measured in surficial sediments along a marine transect from the North Pacific into the Arctic Ocean. The highest average Î£18PAHs concentrations were observed along the continental slope of the Canada Basin in the Arctic (68.3Â Â±Â 8.5Â ngÂ gâ1 dw), followed by sediments in the Chukchi Sea shelf (49.7Â Â±Â 21.2Â ngÂ gâ1 dw) and Bering Sea (39.5Â Â±Â 11.3Â ngÂ gâ1 dw), while the Bering Strait (16.8Â Â±Â 7.1Â ngÂ gâ1 dw) and Central Arctic Ocean sediments (13.1Â Â±Â 9.6Â ngÂ gâ1 dw) had relatively lower average concentrations. The use of principal components analysis with multiple linear regression (PCA/MLR) indicated that on average oil related or petrogenic sources contributed â¼42% of the measured PAHs in the sediments and marked by higher concentrations of two methylnaphthalenes over the non-alkylated parent PAH, naphthalene. Wood and coal combustion contributed â¼32%, and high temperature pyrogenic sources contributing â¼26%. Petrogenic sources, such as oil seeps, allochthonous coal and coastally eroded material such as terrigenous sediments particularly affected the Chukchi Sea shelf and slope of the Canada Basin, while biomass and coal combustion sources appeared to have greater influence in the central Arctic Ocean, possibly due to the effects of episodic summertime forest fires.
Keywords	basins ; biomass ; coal ; combustion ; forest fires ; naphthalene ; oils ; polycyclic aromatic hydrocarbons ; principal component analysis ; regression analysis ; sediments ; summer ; temperature ; wood ; Arctic region ; Bering Sea ; Canada ; Chukchi Sea
Language	English
Size	p. .
Publishing place	Elsevier Ltd
Document type	Article
Note	Pre-press version
ZDB-ID	280652-6
ISSN	1873-6424 ; 0013-9327 ; 0269-7491
ISSN (online)	1873-6424
ISSN	0013-9327 ; 0269-7491
DOI	10.1016/j.envpol.2017.04.087
Database	NAL-Catalogue (AGRICOLA)

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