DIURNAL VARIATION OF WATER VAPOR ISOTOPOLOGUES ON THE CHAJNANTOR PLATEAU DURING THE AUSTRAL SPRING
type: CreativeWork
description: The diurnal variation of water vapor isotopologues over the Chajnantor Plateau during the Austral Spring was investigated using a near continuous record of in situ water vapor isotopologues, numerical modeling, and routine meteorological measurements. On average, there is an approximately 34% increase in the mixing ratio coupled with an 11‰ increase in δ18O, 71‰ increase in δD, and 23‰ decrease in deuterium excess on the Plateau. This significant diurnal variation is a result of the mixing between dry, upper tropospheric air (dry end-member) and a small contribution (9-25%) of a continental (δD < -120‰) source of moisture (wet end-member). While the dry end-member continuously subsides on the Plateau, the continental source is advected onto the Plateau during the day due to a thermally induced, regional, diurnal circulation.
abstract: The diurnal variation of water vapor isotopologues over the Chajnantor Plateau during the Austral Spring was investigated using a near continuous record of in situ water vapor isotopologues, numerical modeling, and routine meteorological measurements. On average, there is an approximately 34% increase in the mixing ratio coupled with an 11‰ increase in δ18O, 71‰ increase in δD, and 23‰ decrease in deuterium excess on the Plateau. This significant diurnal variation is a result of the mixing between dry, upper tropospheric air (dry end-member) and a small contribution (9-25%) of a continental (δD < -120‰) source of moisture (wet end-member). While the dry end-member continuously subsides on the Plateau, the continental source is advected onto the Plateau during the day due to a thermally induced, regional, diurnal circulation.
author: Tunner, Alec
language: English
keywords: Diurnal variation, Water vapor isotopologues
date published: 2015-12-01T08:00:00Z
date modified: 2026-07-24T05:26:22Z
provider: University of New Mexico
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of New Mexico

PropertyValue
property ID: Handle
value: http://hdl.handle.net/1928/31760