Identification

Title

Unprecedented atmospheric ammonia concentrations detected in the high arctic from the 2017 canadian wildfires

Abstract

From 17-22 August 2017 simultaneous enhancements of ammonia (NH3), carbon monoxide(CO), hydrogen cyanide (HCN), and ethane (C2H6) were detected from ground-based solar absorptionFourier transform infrared (FTIR) spectroscopic measurements at two high-Arctic sites: Eureka (80.05◦N,86.42◦W) Nunavut, Canada, and Thule (76.53◦N, 68.74◦W), Greenland. These enhancements wereattributed to wildfires in British Columbia and the Northwest Territories of Canada using FLEXPART back-trajectories and fire locations from Moderate Resolution Imaging Spectroradiometer (MODIS) and found to be the greatest observed enhancements in more than a decade of measurements at Eureka(2006–2017) and Thule (1999–2017). Observations of gas-phase NH3 from these wildfires illustrate thatboreal wildfires may be a considerable episodic source of NH3 in the summertime high Arctic.Comparisons of GEOS-Chem model simulations using the Global Fire Assimilation System (GFASv1.2)biomass burning emissions to FTIR measurements and Infrared Atmospheric Sounding Interferometer (IASI) measurements showed that the transport of wildfire emissions to the Arctic was underestimated inGEOS-Chem. However, GEOS-Chem simulations showed that these wildfires contributed to surface layerNH3and NH+4enhancements of 0.01-0.11 ppbv and 0.05-1.07 ppbv, respectively, over the CanadianArchipelago from 15-23 August 2017.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7x92ffk

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

2019-07-27T00:00:00Z

Frequency of update

Quality and validity

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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