The distinctive isotopic signature of plant-derived chloromethane: possible application in constraining the atmospheric chloromethane budget

DB Harper, JTG Hamilton, V. Ducrocq, JT Kennedy, A. Downey, R. Kalin

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Chloromethane (CH3Cl) is the most abundant halocarbon in the atmosphere. Although largely of natural origin it is responsible for around 17% of chlorine-catalysed ozone destruction. Sources identified to date include biomass burning, oceanic emissions, wood-rotting fungi, higher plants and most recently tropical ferns. Current estimates reveal a shortfall of around 2 million ty-(1) in sources versus sinks for the halocarbon. It is possible that emissions from green plants have been substantially underestimated. A potentially valuable tool for validating emission flux estimates is comparison of the delta(13)C value of atmospheric CH3Cl with those of CH3Cl from the various sources. Here we report delta(13)C values for CH3Cl released by two species of tropical ferns and show that the isotopic signature of CH3Cl from pteridophytes like that of CH3Cl from higher plants is quite different from that of CH3Cl produced by biomass burning, fungi and industry. VC values for CH3Cl produced by Cyathea smithii and Angiopteris evecta were respectively -72.7parts per thousand and -69.3parts per thousand representing depletions relative to plant biomass of 42.3parts per thousand and 43.4parts per thousand. The characteristic isotopic signature of CH3Cl released by green plants should help constrain their contribution to the atmospheric burden when reliable delta(13)C values for all other major sources of CH3Cl are obtained and a globally averaged delta(13)C value for atmospheric CH3Cl is available. (C) 2003 Published by Elsevier Science Ltd.
LanguageEnglish
Pages433-436
Number of pages4
JournalChemosphere
Volume52
Issue number2
DOIs
Publication statusPublished - Jul 2003

Fingerprint

Methyl Chloride
Halocarbons
Biomass
Fungi
halocarbon
fern
biomass burning
Ozone
Chlorine
fungus
Wood
Fluxes
chlorine
ozone
budget
Industry
atmosphere
industry
biomass

Keywords

  • tropical fern
  • cyathea smithii
  • angiopteris evecta
  • carbon isotope ratio
  • methyl chloride
  • isotopic signature

Cite this

Harper, DB ; Hamilton, JTG ; Ducrocq, V. ; Kennedy, JT ; Downey, A. ; Kalin, R. / The distinctive isotopic signature of plant-derived chloromethane: possible application in constraining the atmospheric chloromethane budget. In: Chemosphere. 2003 ; Vol. 52, No. 2. pp. 433-436.
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abstract = "Chloromethane (CH3Cl) is the most abundant halocarbon in the atmosphere. Although largely of natural origin it is responsible for around 17{\%} of chlorine-catalysed ozone destruction. Sources identified to date include biomass burning, oceanic emissions, wood-rotting fungi, higher plants and most recently tropical ferns. Current estimates reveal a shortfall of around 2 million ty-(1) in sources versus sinks for the halocarbon. It is possible that emissions from green plants have been substantially underestimated. A potentially valuable tool for validating emission flux estimates is comparison of the delta(13)C value of atmospheric CH3Cl with those of CH3Cl from the various sources. Here we report delta(13)C values for CH3Cl released by two species of tropical ferns and show that the isotopic signature of CH3Cl from pteridophytes like that of CH3Cl from higher plants is quite different from that of CH3Cl produced by biomass burning, fungi and industry. VC values for CH3Cl produced by Cyathea smithii and Angiopteris evecta were respectively -72.7parts per thousand and -69.3parts per thousand representing depletions relative to plant biomass of 42.3parts per thousand and 43.4parts per thousand. The characteristic isotopic signature of CH3Cl released by green plants should help constrain their contribution to the atmospheric burden when reliable delta(13)C values for all other major sources of CH3Cl are obtained and a globally averaged delta(13)C value for atmospheric CH3Cl is available. (C) 2003 Published by Elsevier Science Ltd.",
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The distinctive isotopic signature of plant-derived chloromethane: possible application in constraining the atmospheric chloromethane budget. / Harper, DB; Hamilton, JTG; Ducrocq, V.; Kennedy, JT; Downey, A.; Kalin, R.

In: Chemosphere, Vol. 52, No. 2, 07.2003, p. 433-436.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The distinctive isotopic signature of plant-derived chloromethane: possible application in constraining the atmospheric chloromethane budget

AU - Harper, DB

AU - Hamilton, JTG

AU - Ducrocq, V.

AU - Kennedy, JT

AU - Downey, A.

AU - Kalin, R.

N1 - 2nd International Conference on Naturally Produced Organohalogens, HEIDELBERG, GERMANY, SEP 30-OCT 03, 2001

PY - 2003/7

Y1 - 2003/7

N2 - Chloromethane (CH3Cl) is the most abundant halocarbon in the atmosphere. Although largely of natural origin it is responsible for around 17% of chlorine-catalysed ozone destruction. Sources identified to date include biomass burning, oceanic emissions, wood-rotting fungi, higher plants and most recently tropical ferns. Current estimates reveal a shortfall of around 2 million ty-(1) in sources versus sinks for the halocarbon. It is possible that emissions from green plants have been substantially underestimated. A potentially valuable tool for validating emission flux estimates is comparison of the delta(13)C value of atmospheric CH3Cl with those of CH3Cl from the various sources. Here we report delta(13)C values for CH3Cl released by two species of tropical ferns and show that the isotopic signature of CH3Cl from pteridophytes like that of CH3Cl from higher plants is quite different from that of CH3Cl produced by biomass burning, fungi and industry. VC values for CH3Cl produced by Cyathea smithii and Angiopteris evecta were respectively -72.7parts per thousand and -69.3parts per thousand representing depletions relative to plant biomass of 42.3parts per thousand and 43.4parts per thousand. The characteristic isotopic signature of CH3Cl released by green plants should help constrain their contribution to the atmospheric burden when reliable delta(13)C values for all other major sources of CH3Cl are obtained and a globally averaged delta(13)C value for atmospheric CH3Cl is available. (C) 2003 Published by Elsevier Science Ltd.

AB - Chloromethane (CH3Cl) is the most abundant halocarbon in the atmosphere. Although largely of natural origin it is responsible for around 17% of chlorine-catalysed ozone destruction. Sources identified to date include biomass burning, oceanic emissions, wood-rotting fungi, higher plants and most recently tropical ferns. Current estimates reveal a shortfall of around 2 million ty-(1) in sources versus sinks for the halocarbon. It is possible that emissions from green plants have been substantially underestimated. A potentially valuable tool for validating emission flux estimates is comparison of the delta(13)C value of atmospheric CH3Cl with those of CH3Cl from the various sources. Here we report delta(13)C values for CH3Cl released by two species of tropical ferns and show that the isotopic signature of CH3Cl from pteridophytes like that of CH3Cl from higher plants is quite different from that of CH3Cl produced by biomass burning, fungi and industry. VC values for CH3Cl produced by Cyathea smithii and Angiopteris evecta were respectively -72.7parts per thousand and -69.3parts per thousand representing depletions relative to plant biomass of 42.3parts per thousand and 43.4parts per thousand. The characteristic isotopic signature of CH3Cl released by green plants should help constrain their contribution to the atmospheric burden when reliable delta(13)C values for all other major sources of CH3Cl are obtained and a globally averaged delta(13)C value for atmospheric CH3Cl is available. (C) 2003 Published by Elsevier Science Ltd.

KW - tropical fern

KW - cyathea smithii

KW - angiopteris evecta

KW - carbon isotope ratio

KW - methyl chloride

KW - isotopic signature

U2 - 10.1016/S0045-6535(03)00206-6

DO - 10.1016/S0045-6535(03)00206-6

M3 - Article

VL - 52

SP - 433

EP - 436

JO - Chemosphere

T2 - Chemosphere

JF - Chemosphere

SN - 0045-6535

IS - 2

ER -