Identification

Title

Hydrogen peroxide, methyl hydroperoxide, and formaldehdye over North America and the North Atlantic

Abstract

Hydrogen peroxide (H₂O), methyl hydroperoxide (CH₃OOH), and formaldehyde (CH₂O) were measured over North America and the North Atlantic during the INTEX-NA, TOPSE, and SONEX aircraft campaigns. An overview of H₂O₂, CH₃OOH, and CH₂O across the geographic and temporal range of these campaigns is presented. H₂O₂, CH₃OOH, and CH₂O mixing ratios and variability were larger during INTEX-NA compared to TOPSE and SONEX. Mean H₂O₂, CH₃OOH, and CH₂O were 1390, 440, and 480 pptv, respectively, more than two times higher than TOPSE measurements and an order of magnitude higher than SONEX measurements. This is attributed to higher solar radiation levels and the more polluted conditions of INTEX-NA. Mixing ratios and variability decreased with altitude for all three gases and on all three campaigns, except for CH₃OOH during TOPSE. The impact of convection on H₂O₂, CH₃OOH, and CH₂O is also discussed. Using the ratio H₂O₂/CH₃OOH, convectively influenced air parcels were found to be enhanced in CH₃OOH, CH₂O, CO, NO, and NO₂ while H₂O₂ and HNO3 were depleted by wet removal. Biomass burning was also shown to increase H₂O₂, CH₃OOH, and CH₂O mixing ratios up to 1.5, 2, and 1 ppbv, respectively, even after 4-5 days of transit. Results from this study show considerable variability in H₂O₂, CH₃OOH, and CH₂O throughout the North American and North Atlantic troposphere. The variability in the upper troposphere is driven by local photochemical production and transport via regional convection and long-range pathways, suggesting transport mechanisms are important factors to include in photochemical models simulating H₂O₂, CH₃OOH, CH₂O, and HOx.

Resource type

document

Resource locator

Unique resource identifier

code

https://n2t.org/ark:/85065/d7t43t92

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

2007-05-03T00:00:00Z

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