干旱区生态环境知识资源中心(Arid): Seasonal Variations and Driving Factors of the Eastern Maine Coastal Current

Arid

DOI	10.1029/2021JC017665
	Seasonal Variations and Driving Factors of the Eastern Maine Coastal Current
	Li, Denghui; Wang, Zhengui; Xue, Huijie; Thomas, Andrew C.; Pettigrew, Neal; Yund, Philip O.
通讯作者	Xue, HJ (corresponding author), Univ Maine, Sch Marine Sci, Orono, ME 04469 USA.
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN	2169-9275
EISSN	2169-9291
出版年	2021
卷号	126 期号:11
英文摘要	To investigate the coastal current in the Gulf of Maine (GoME) and its relation to forcing from outside of the gulf, a high-resolution circulation model was developed and validated. Our model shows that the Eastern Maine Coastal Current (EMCC) possesses two cores, an offshore and a nearshore core that peak in summer and spring, respectively. The two cores can be traced back to outflows from the Bay of Fundy from opposite sides of Grand Manan Island, and both cores are deeper and slightly more onshore in summer and fall in response to tidal mixing, surface thermal stratification and wind. The two cores merge south of Pleasant Bay, then split into two branches again east of Mount Desert Rock, where the nearshore branch flows along the coast, while the offshore branch turns southward to recirculate in the eastern GoME. Subject to variations of Scotian Shelf Water and Slope Water (SW) inflows, the offshore veering occurs further upstream (northeastward) in late winter and summer, but gradually shifts downstream (southwestward) from summer to winter. Diagnosis of momentum balance demonstrates that the EMCC is primarily driven by the pressure gradient force (PG), of which the barotropic PG is dominant and offshore, while the baroclinic PG is onshore and increases with depth. The large baroclinic PG at depths, modulated by SW, that is, blended by tidal mixing, offsets the barotropic PG. Near the surface, the barotropic PG is nearly balanced by the Coriolis force, forming the geostrophic EMCC. Plain Language Summary The coastal current in the Gulf of Maine (GoME) plays an important role in modulating fisheries in Maine. To investigate the coastal current and its relation to different forcing, a high-resolution circulation model was developed and validated. Our model shows that in the eastern GoME, the coastal current has two cores, namely an offshore and a nearshore core peaking in summer and spring, respectively. The two cores can be traced back to outflows from the adjacent Bay of Fundy. Both cores are deeper and slightly more onshore in summer and fall due to tidal mixing, large solar radiation and weak wind. The two cores merge as they flow downstream, then bifurcate again east of Mount Desert Rock, where the nearshore branch flows along the coast, while the offshore one turns southward. Subject to variations of inflows from outside of the gulf, the offshore turning occurs further upstream in late winter and summer, but gradually shifts downstream from summer to winter. Analyses of momentum balance show that the coastal current is primarily modulated by the variation of deep denser water inflow that is blended by tidal mixing.
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000723095600026
WOS关键词	GULF ; CIRCULATION ; MODEL ; VARIABILITY ; TRANSPORT ; BLOOM ; OCEAN ; COMPLEX ; SYSTEM ; FUNDY
WOS类目	Oceanography
WOS研究方向	Oceanography
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/373703
作者单位	[Li, Denghui; Wang, Zhengui; Xue, Huijie; Thomas, Andrew C.; Pettigrew, Neal] Univ Maine, Sch Marine Sci, Orono, ME 04469 USA; [Wang, Zhengui] Virginia Inst Marine Sci, Coll William & Mary, Gloucester Point, VA 23062 USA; [Yund, Philip O.] Downeast Inst, Beals, ME USA
推荐引用方式 GB/T 7714	Li, Denghui,Wang, Zhengui,Xue, Huijie,et al. Seasonal Variations and Driving Factors of the Eastern Maine Coastal Current[J],2021,126(11).
APA	Li, Denghui,Wang, Zhengui,Xue, Huijie,Thomas, Andrew C.,Pettigrew, Neal,&Yund, Philip O..(2021).Seasonal Variations and Driving Factors of the Eastern Maine Coastal Current.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,126(11).
MLA	Li, Denghui,et al."Seasonal Variations and Driving Factors of the Eastern Maine Coastal Current".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 126.11(2021).