Identification

Title

17 O-excess in tropical cyclones reflects local rain re-evaporation more than moisture source conditions

Abstract

O-17-excess is a relatively new water isotope parameter that could potentially provide useful information about the hydrological cycle. Previous works focusing on O-17-excess in polar regions suggest that it primarily tracks moisture source relative humidity, but little is known about how to interpret O-17-excess data in lower latitudes. Here we present quasi-hourly triple oxygen isotope data of precipitation collected from two tropical cyclones in Texas and Louisiana in 2020 to understand the impacts of environmental and meteorological processes on the(17)O-excess of low-to mid-latitude precipitation. We find that at both hourly time scales and the event scale,O-17-excess is strongly correlated to changes in on-site rainfall intensity and relative humidity, which is consistent with the theory that the isotopic fraction at ion associated with rain re-evaporation lowers the(17)O-excess of the remaining droplet. In addition, although evaporative conditions at the moisture source region may also influence( 17)O-excess of water vapor transported to the precipitation site, their impacts are likely over printed by the post-condensation rain re-evaporation processes. Our results thus suggest that O-17-excess can be used as a proxy for local rather than source region evaporative conditions during tropical cyclones.

Resource type

document

Resource locator

Unique resource identifier

code

https://n2t.org/ark:/85065/d7df6wc9

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

publication

effective date

2024-03-28T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Limitations on public access

None

Responsible organisations

Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact