Ammonia flux measurements above a corn canopy using relaxed eddy accumulation and a flux gradient system

Nelson, Andrew J.; Lichiheb, Nebila; Koloutsou-Vakakis, Sotiria; Rood, Mark J.; Heuer, Mark; Myles, LaToya; Joo, Eva; Miller, Jesse; Bernacchi, Carl

doi:10.1016/j.agrformet.2018.10.003

Advanced Search

Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

Advanced Search
Custom Query

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields

Language:

Dates

Publication Date Range:

to

Document Data

Title:

Document Type:

Library

Collection:

Series:

People

Author:

Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page

i

Ammonia flux measurements above a corn canopy using relaxed eddy accumulation and a flux gradient system

2019
By Nelson, Andrew J. ; Lichiheb, Nebila ; Koloutsou-Vakakis, Sotiria ; ...
Source: Agricultural and Forest Meteorology, 264, 104-113.

[PDF-881.46 KB]

Details You May Also Like

Details:

Journal Title:

Agricultural and Forest Meteorology
Personal Author:

Nelson, Andrew J. ; Lichiheb, Nebila ; Koloutsou-Vakakis, Sotiria ; Rood, Mark J. ; Heuer, Mark ; ... More +

Nelson, Andrew J. ; Lichiheb, Nebila ; Koloutsou-Vakakis, Sotiria ; Rood, Mark J. ; Heuer, Mark ; Myles, LaToya ; Joo, Eva ; Miller, Jesse ; Bernacchi, Carl Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; ARL (Air Resources Laboratory)

OAR (Oceanic and Atmospheric Research) ; ARL (Air Resources Laboratory) Less -
Description:

Studies of NH3 flux over agricultural ecosystems in the USA are limited by low temporal resolution (typically hours or days) and sparse spatial coverage, with no studies over corn in the Midwest USA. We report on NH3 flux measurements over a corn canopy in Central Illinois, USA, using the relaxed eddy accumulation (REA) and flux gradient (FG) methods, providing measurements at 4 h and 0.5 h intervals, respectively. The REA and FG systems were operated for the duration of the 2014 corn-growing season. Flux-footprint analysis was used to select data from both systems, resulting in 82 concurrent measurements. Mean NH3 flux of concurrent measurements was 205 +/- 300 ng m(-2) s(-1) from REA and 110 +/- 256 ng m(-2) s(-1) from FG for all concurrent samples. Results from both methods were not significantly different at a 95% confidence level for all concurrent measurements. The FG system resolved NH3 emission peaks at 0.5 h averaging time that were otherwise un-observed with 4 h REA averaging. Two early-season peak emission periods were identified (DOY 130-132 and 140-143), where the timing and intensity of such emissions were attributed to a combination of urease inhibitor, applied as a field management decision, and localized soil temperature and precipitation. Given the dependence of NH3 fluxes on multiple parameters, this study further highlights the need for increased spatial coverage and high temporal resolution (e.g., < 1 h) of measurements to better understand the impact of agricultural NH3 emissions on air quality and the global nitrogen cycle. Such measurements are also needed for evaluation of models describing surface-atmosphere exchange of NH3.
Source:

Agricultural and Forest Meteorology, 264, 104-113.
DOI:

https://doi.org/10.1016/j.agrformet.2018.10.003
Document Type:

Journal Article
Rights Information:

Accepted Manuscript
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:27df5408403306cf3dd44e849cae46da6fe688a781bfd4c244f8116e25578a38
Download URL:

https://repository.library.noaa.gov/view/noaa/20743/noaa_20743_DS1.pdf
File Type:

No Additional Files

More +

Ammonia flux measurements above a corn canopy using relaxed eddy accumulation and a flux gradient system

Details:

Supporting Files

You May Also Like