气候变化领域集成服务门户(CCPortal): A 42 year inference of cloud base height trends in the Luquillo Mountains of northeastern Puerto Rico

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DOI	10.3354/cr01529
	A 42 year inference of cloud base height trends in the Luquillo Mountains of northeastern Puerto Rico
	Miller P.W.; Mote T.L.; Ramseyer C.A.; Van Beusekom A.E.; Scholl M.; González G.
发表日期	2018
ISSN	0936-577X
起始页码	87
结束页码	94
卷号	76 期号:1
英文摘要	The Luquillo Mountains of eastern Puerto Rico are home to the only tropical rainforest managed by the United States Forest Service, with cloud-immersed forests historically occupying the highest elevations. However, within the past 50 yr, studies of the Luquillo cloud forest have suggested an increase in cloud base heights (CBH), although the CBH in the area was not quantified until recently. The present work uses radiosonde observations from nearby San Juan, Puerto Rico, to contextualize the present-day CBH within a 42 yr (1975-2016) proxy record and determine evidence for rising cloud base. Two key questions are addressed: (1) Can theoretical CBH calculations from San Juan provide a reasonable proxy for CBHs in the Luquillo Mountains? (2) Does a significant trend accompany the CBH lifting inferred from recent work in the region? The mean-layer lifted condensation level (MLLCL), a thermodynamic parameter expressing the altitude at which a rising air parcel reaches 100% relative humidity, serves as the proxy. The 42 yr MLLCL time series corroborates both the low CBHs claimed in the 1980s and the higher CBHs documented by recent work. When considering all available radiosonde data, statistically significant increasing CBH trends are detected for all seasons. However, when the record is standardized to correct for progressive vertical resolution improvements to radiosonde observations, recent CBH increases are more modest than initially indicated, and statistically significant increases are only apparent in the late rainfall season. © Inter-Research 2018.
英文关键词	Caribbean; Cloud base height; Cloud forest; Lifted condensation level; Luquillo Mountains; Tropical rainforest
语种	英语
scopus关键词	cloud forest; condensation; proxy climate record; radiosonde; rainforest; theoretical study; time series analysis; tropical forest; Luquillo Mountains; Puerto Rico; San Juan [Puerto Rico]
来源期刊	Climate Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146966
作者单位	Department of Geography, University of Georgia, Athens, GA 30602, United States; Department of Geography and Geosciences, Salisbury University, Salisbury, MD 21801, United States; International Institute of Tropical Forestry, US Department of Agriculture (USDA) Forest Service, RÍo Piedras, PR 00926, United States; Earth System Processes Division, United States Geological Survey, Reston, VA 20192, United States
推荐引用方式 GB/T 7714	Miller P.W.,Mote T.L.,Ramseyer C.A.,et al. A 42 year inference of cloud base height trends in the Luquillo Mountains of northeastern Puerto Rico[J],2018,76(1).
APA	Miller P.W.,Mote T.L.,Ramseyer C.A.,Van Beusekom A.E.,Scholl M.,&González G..(2018).A 42 year inference of cloud base height trends in the Luquillo Mountains of northeastern Puerto Rico.Climate Research,76(1).
MLA	Miller P.W.,et al."A 42 year inference of cloud base height trends in the Luquillo Mountains of northeastern Puerto Rico".Climate Research 76.1(2018).