Trend and Multi‐Frequency Analysis Through Empirical Mode Decomposition: An Application to a 20‐Year Record of Atmospheric Carbonyl Sulfide Measurements

Serio, C.; Montzka, S. A.; Masiello, G.; Carbone, V.

doi:10.1029/2022jd038207

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Trend and Multi‐Frequency Analysis Through Empirical Mode Decomposition: An Application to a 20‐Year Record of Atmospheric Carbonyl Sulfide Measurements

2023
By Serio, C. ; Montzka, S. A. ; Masiello, G. ; ...
Source: Journal of Geophysical Research: Atmospheres, 128(3)

[PDF-1.16 MB]

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Details:

Journal Title:

Journal of Geophysical Research: Atmospheres
Personal Author:

Serio, C. ; Montzka, S. A. ; Masiello, G. ; Carbone, V.

Serio, C. ; Montzka, S. A. ; Masiello, G. ; Carbone, V. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; GML (Global Monitoring Laboratory)

OAR (Oceanic and Atmospheric Research) ; GML (Global Monitoring Laboratory) Less -
Description:

The Empirical Mode Decomposition (EMD) is a fully non-parametric analysis of frequency modes and trends in a given series that is based on the data alone. We have devised an improved strategy based on a series of best practices to use EMD successfully in the analysis of the monthly time series of carbonyl sulfide (OCS) atmospheric mole fractions measured at NOAA network stations (2000–2020). Long-term trends and intra- and inter-annual variability has been assessed. After a phase of generally increasing mole fractions up to 2015, with a temporary decline around 2009, we found that the OCS atmospheric mole fraction subsequently decreased at all stations, reflecting a recent imbalance in its total sources and losses. Our analysis has revealed a characteristic time scale for variation of 8–10 years. The variance associated with this long-term behavior ranges from urn:x-wiley:2169897X:media:jgrd58461:jgrd58461-math-000115% to 40% of the total strength of the signal, depending on location. Apart from this complex long-term behavior, the OCS time series show a strong annual cycle, which primarily results from the well-known OCS uptake by vegetation. In addition, we have also found one more frequency of minor variance intensity in the measured mole fraction time-history, which corresponds to periods in the range of 2–3 years. This inter-annual variability of OCS may be linked to the Quasi-Biennial Oscillation.
Keywords:

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Atmospheric Science Earth And Planetary Sciences (miscellaneous) Geophysics Space And Planetary Science
Source:

Journal of Geophysical Research: Atmospheres, 128(3)
DOI:

https://doi.org/10.1029/2022jd038207
ISSN:

2169-897X;2169-8996;
Format:

PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
License:

https://creativecommons.org/licenses/by/4.0/
Rights Information:

CC BY
Compliance:

Library
Main Document Checksum:

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urn:sha256:bcbe1401ef5647505ff344d98d59f6803c6e389d2cd9f882c13e84ee2bb4d456
Download URL:

https://repository.library.noaa.gov/view/noaa/54632/noaa_54632_DS1.pdf
File Type:

	Supplemental media	docx
	Supplemental media	xlsx

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