Variability of dissolved organic carbon in precipitation during storms at the Shale Hills Critical Zone Observatory

Lidiia Iavorivska, Elizabeth Weeks Boyer, Jeffrey Wayne Grimm, Matthew P. Miller, David R. DeWalle, Kenneth James Davis, Margot Wilkinson Kaye

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Organic compounds are removed from the atmosphere and deposited to the Earth's surface via precipitation. In this study, we quantified variations of dissolved organic carbon (DOC) in precipitation during storm events at the Shale Hills Critical Zone Observatory, a forested watershed in central Pennsylvania (USA). Precipitation samples were collected consecutively throughout the storm during 13 events, which spanned a range of seasons and synoptic meteorological conditions, including a hurricane. Further, we explored factors that affect the temporal variability by considering relationships of DOC in precipitation with atmospheric and storm characteristics. Concentrations and chemical composition of DOC changed considerably during storms, with the magnitude of change within individual events being comparable or higher than the range of variation in average event composition among events. Although some previous studies observed that concentrations of other elements in precipitation typically decrease over the course of individual storm events, results of this study show that DOC concentrations in precipitation are highly variable. During most storm events, concentrations decreased over time, possibly as a result of washing out of the below-cloud atmosphere. However, increasing concentrations that were observed in the later stages of some storm events highlight that DOC removal with precipitation is not merely a dilution response. Increases in DOC during events could result from advection of air masses, local emissions during breaks in precipitation, or chemical transformations in the atmosphere that enhance solubility of organic carbon compounds. This work advances understanding of processes occurring during storms that are relevant to studies of atmospheric chemistry, carbon cycling, and ecosystem responses.

Original languageEnglish (US)
Pages (from-to)2935-2950
Number of pages16
JournalHydrological Processes
Volume31
Issue number16
DOIs
StatePublished - Jul 30 2017

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dissolved organic carbon
shale
observatory
atmosphere
ecosystem response
atmospheric chemistry
air mass
hurricane
organic compound
advection
solubility
dilution
chemical composition
organic carbon
watershed
carbon

All Science Journal Classification (ASJC) codes

  • Water Science and Technology

Cite this

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title = "Variability of dissolved organic carbon in precipitation during storms at the Shale Hills Critical Zone Observatory",
abstract = "Organic compounds are removed from the atmosphere and deposited to the Earth's surface via precipitation. In this study, we quantified variations of dissolved organic carbon (DOC) in precipitation during storm events at the Shale Hills Critical Zone Observatory, a forested watershed in central Pennsylvania (USA). Precipitation samples were collected consecutively throughout the storm during 13 events, which spanned a range of seasons and synoptic meteorological conditions, including a hurricane. Further, we explored factors that affect the temporal variability by considering relationships of DOC in precipitation with atmospheric and storm characteristics. Concentrations and chemical composition of DOC changed considerably during storms, with the magnitude of change within individual events being comparable or higher than the range of variation in average event composition among events. Although some previous studies observed that concentrations of other elements in precipitation typically decrease over the course of individual storm events, results of this study show that DOC concentrations in precipitation are highly variable. During most storm events, concentrations decreased over time, possibly as a result of washing out of the below-cloud atmosphere. However, increasing concentrations that were observed in the later stages of some storm events highlight that DOC removal with precipitation is not merely a dilution response. Increases in DOC during events could result from advection of air masses, local emissions during breaks in precipitation, or chemical transformations in the atmosphere that enhance solubility of organic carbon compounds. This work advances understanding of processes occurring during storms that are relevant to studies of atmospheric chemistry, carbon cycling, and ecosystem responses.",
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Variability of dissolved organic carbon in precipitation during storms at the Shale Hills Critical Zone Observatory. / Iavorivska, Lidiia; Boyer, Elizabeth Weeks; Grimm, Jeffrey Wayne; Miller, Matthew P.; DeWalle, David R.; Davis, Kenneth James; Kaye, Margot Wilkinson.

In: Hydrological Processes, Vol. 31, No. 16, 30.07.2017, p. 2935-2950.

Research output: Contribution to journalArticle

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T1 - Variability of dissolved organic carbon in precipitation during storms at the Shale Hills Critical Zone Observatory

AU - Iavorivska, Lidiia

AU - Boyer, Elizabeth Weeks

AU - Grimm, Jeffrey Wayne

AU - Miller, Matthew P.

AU - DeWalle, David R.

AU - Davis, Kenneth James

AU - Kaye, Margot Wilkinson

PY - 2017/7/30

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AB - Organic compounds are removed from the atmosphere and deposited to the Earth's surface via precipitation. In this study, we quantified variations of dissolved organic carbon (DOC) in precipitation during storm events at the Shale Hills Critical Zone Observatory, a forested watershed in central Pennsylvania (USA). Precipitation samples were collected consecutively throughout the storm during 13 events, which spanned a range of seasons and synoptic meteorological conditions, including a hurricane. Further, we explored factors that affect the temporal variability by considering relationships of DOC in precipitation with atmospheric and storm characteristics. Concentrations and chemical composition of DOC changed considerably during storms, with the magnitude of change within individual events being comparable or higher than the range of variation in average event composition among events. Although some previous studies observed that concentrations of other elements in precipitation typically decrease over the course of individual storm events, results of this study show that DOC concentrations in precipitation are highly variable. During most storm events, concentrations decreased over time, possibly as a result of washing out of the below-cloud atmosphere. However, increasing concentrations that were observed in the later stages of some storm events highlight that DOC removal with precipitation is not merely a dilution response. Increases in DOC during events could result from advection of air masses, local emissions during breaks in precipitation, or chemical transformations in the atmosphere that enhance solubility of organic carbon compounds. This work advances understanding of processes occurring during storms that are relevant to studies of atmospheric chemistry, carbon cycling, and ecosystem responses.

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