Seasonal and Elevational Variability in Dwarf Birch VOC Emissions in Greenlandic Tundra DOI Creative Commons
Jolanta Rieksta, Tao Li, Cleo L. Davie‐Martin

et al.

Journal of Geophysical Research Biogeosciences, Journal Year: 2023, Volume and Issue: 128(11)

Published: Nov. 1, 2023

Abstract Rising temperatures amplify biogenic volatile organic compound (VOC) emissions from Arctic vegetation, causing feedbacks to the climate system. Changes in also alter plant physiology and vegetation composition, all of which can influence VOC emissions. Moreover, leaf development biotic stresses cause highly variable during growing season. Therefore, linking with traits tracking responses change might provide better understanding emission regulation under future conditions. We measured other dwarf birch ( Betula glandulosa ) at two elevations Narsarsuaq, South Greenland. The measurements were performed warming experiments that have run since 2016. collected VOCs using branch enclosure method early June until late July 2019 n = 200). Emissions green volatiles (GLVs), oxygenated monoterpenes (oMTs), homoterpenes followed a seasonal trend. rates diversity blend decreased end measurement period. Differences between pronounced Majority did not explain variation show strong variability within season, is likely driven by phenology. While was greater milder low‐elevation site, higher or similar harsher high‐elevation showing stronger potentials than previously assumed. Seasonal variations are crucial for accurate predictions current arctic ecosystems.

Language: Английский

Strong isoprene emission response to temperature in tundra vegetation DOI Creative Commons
Roger Seco, Thomas Holst, Cleo L. Davie‐Martin

et al.

Proceedings of the National Academy of Sciences, Journal Year: 2022, Volume and Issue: 119(38)

Published: Sept. 12, 2022

Emissions of biogenic volatile organic compounds (BVOCs) are a crucial component biosphere–atmosphere interactions. In northern latitudes, climate change is amplified by feedback processes in which BVOCs have recognized, yet poorly quantified role, mainly due to lack measurements and concomitant modeling gaps. Hence, current Earth system models mostly rely on temperature responses measured vegetation from lower rendering their predictions highly uncertain. Here, we show how tundra isoprene emissions respond vigorously increases, compared model results. Our unique dataset direct eddy covariance ecosystem-level two contrasting ecosystems exhibited Q 10 (the factor the emission rate increases with °C rise temperature) coefficients up 20.8, that is, 3.5 times 5.9 derived equivalent calculations. Crude estimates using observed indicate could enhance 41% (87%)—that 46% (55%) more than estimated models—with 2 (4 °C) warming. results demonstrate possesses potential substantially boost its response future rising temperatures, at rates exceed predictions.

Language: Английский

Citations

44
High emission rates and strong temperature response make boreal wetlands a large source of isoprene and terpenes DOI Creative Commons
Lejish Vettikkat,

Pasi Miettinen,

Angela Buchholz

et al.

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(4), P. 2683 - 2698

Published: Feb. 27, 2023

Abstract. Wetlands cover only 3 % of the global land surface area, but boreal wetlands are experiencing an unprecedented warming four times average. These emit isoprene and terpenes (including monoterpenes (MT), sesquiterpenes (SQT), diterpenes (DT)), which climate-relevant highly reactive biogenic volatile organic compounds (BVOCs) with exponential dependence on temperature. In this study, we present ecosystem-scale eddy covariance (EC) fluxes isoprene, MT, SQT, DT (hereafter referred to together as terpenes) at Siikaneva, a fen in southern Finland, from start peak growing season 2021 (19 May 28 June 2021). first EC reported using novel state-of-the-art Vocus proton transfer reaction mass spectrometer (Vocus-PTR) first-ever for DTs wetland. Isoprene was dominant compound emitted by wetland, followed MTs, SQTs, DTs, they all exhibited strong temperature dependence. The Q10 values, factor terpene emissions increases every 10 ∘C rise temperature, were up five higher than those used most BVOC models. During campaign, air peaked above 31 21–22 2021, is abnormally high environments, maximum flux coincided period. We observed that elevated after “high-temperature stress period”, indicating past temperatures alter significantly. standardized emission (EF) (EFiso) 11.1 ± 0.3 nmol m−2 s−1, least two previous studies factors typical broadleaf other forests lower latitudes. EFMT 2.4 0.1 EFSQT 1.3 0.03 needle leaf tree functional types, EFDT 0.011 0.001 s−1. also compared landscape average model gases aerosols nature (MEGAN) v2.1 found underestimated over 9 300 800 SQTs. Our results show due very EFs sensitivity increasing temperatures, these high-latitude ecosystems can be large source atmosphere, anthropogenic could induce much future.

Language: Английский

Citations

30
High temperature sensitivity of monoterpene emissions from global vegetation DOI Creative Commons
Efstratios Bourtsoukidis, Andrea Pozzer, Jonathan Williams

et al.

Communications Earth & Environment, Journal Year: 2024, Volume and Issue: 5(1)

Published: Jan. 8, 2024

Abstract Terrestrial vegetation emits vast amounts of monoterpenes into the atmosphere, influencing ecological interactions and atmospheric chemistry. Global emissions are simulated as a function temperature with fixed exponential relationship (β coefficient) across forest ecosystems environmental conditions. We applied meta-analysis algorithms on 40 years published monoterpene emission data show that between is more sensitive intricate than previously thought. Considering entire dataset, higher sensitivity = 0.13 ± 0.01 °C −1 ) derived but linear increase reported coefficients determination (R 2 ), indicating co-occurring factors modify primarily related to specific plant functional type (PFT). Implementing PFT-dependent β in biogenic model, coupled chemistry – climate demonstrated processes exceptionally dependent which subject amplified variations under rising temperatures.

Language: Английский

Citations

16
Biogenic volatile organic compounds emissions, atmospheric chemistry, and environmental implications: a review DOI
Luxi Wang,

Xiaoxiu Lun,

Qiang Wang

et al.

Environmental Chemistry Letters, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 4, 2024

Language: Английский

Citations

8
High temperature sensitivity of Arctic isoprene emissions explained by sedges DOI Creative Commons
Hui Wang, Allison Welch, Sanjeevi Nagalingam

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: July 21, 2024

Abstract It has been widely reported that isoprene emissions from the Arctic ecosystem have a strong temperature response. Here we identify sedges ( Carex spp. and Eriophorum spp.) as key contributors to this high sensitivity using plant chamber experiments. We observe exhibit markedly stronger response compared of other emitters predictions by accepted emission model, Model Emissions Gases Aerosols Nature (MEGAN). MEGAN is able reproduce eddy-covariance flux observations at three high-latitude sites integrating our findings. Furthermore, omission responses causes 20% underestimation for regions Northern Hemisphere during 2000-2009 in Community Land with scheme. also find existing model had underestimated long-term trend 1960 2009 55% regions.

Language: Английский

Citations

7
Optimizing the Isoprene Emission Model MEGAN With Satellite and Ground‐Based Observational Constraints DOI Creative Commons
Christian DiMaria, Dylan B. A. Jones, H. M. Worden

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2023, Volume and Issue: 128(4)

Published: Feb. 2, 2023

Abstract Isoprene is a hydrocarbon emitted in large quantities by terrestrial vegetation. It precursor to several air quality and climate pollutants including ozone. Emission rates vary with plant species environmental conditions. This variability can be modeled using the Model of Emissions Gases Aerosols from Nature (MEGAN). MEGAN parameterizes isoprene emission as vegetation‐specific standard rate which modulated scaling factors that depend on meteorological driving variables. Recent experiments have identified uncertainties temperature response parameterization, while under conditions are poorly constrained some regions due lack representative measurements landcover. In this study, we use Bayesian model‐data fusion optimize satellite‐ ground‐based observational constraints. Optimization satellite constraints reduced model biases but was highly sensitive input errors drought stress found inconsistent at an Amazonian field site, reflecting satellite‐based emissions. increased sensitivity factor five site had no impact UK demonstrating significant ecosystem‐dependent sensitivity. Ground‐based across wide range ecosystems will key for obtaining accurate representation global biogeochemical models.

Language: Английский

Citations

16
Temperature and light dependency of isoprene and monoterpene emissions from tropical and subtropical trees: Field observations in south China DOI
Jianqiang Zeng, Yanli Zhang, Zhaobin Mu

et al.

Applied Geochemistry, Journal Year: 2023, Volume and Issue: 155, P. 105727 - 105727

Published: June 19, 2023

Language: Английский

Citations

16
Interannual variability of summertime formaldehyde (HCHO) vertical column density and its main drivers at northern high latitudes DOI Creative Commons

Tianlang Zhao,

Jingqiu Mao, Zolal Ayazpour

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(10), P. 6105 - 6121

Published: May 28, 2024

Abstract. The northern high latitudes (50–90° N, mostly including boreal-forest and tundra ecosystems) have been undergoing rapid climate ecological changes over recent decades, leading to significant variations in volatile organic compounds (VOC) emissions from biogenic biomass burning sources. Formaldehyde (HCHO) is an indicator of VOC emissions, but the interannual variability HCHO its main drivers region remains unclear. In this study, we use GEOS-Chem chemical transport model satellite retrievals Ozone Monitoring Instrument (OMI) Mapping Profiler Suite (OMPS) examine vertical column density (VCD) during summer seasons spanning 2005 2019. Our results show that, 2005–2019 summers, wildfires contributed 75 %–90 % VCD Siberia, Alaska Canada, while background methane oxidation account for ∼ 90 eastern Europe. We find that monthly solar-induced chlorophyll fluorescence (SIF) Orbiting Carbon Observatory-2 (OCO-2), efficient proxy plant photosynthesis, shows a good linear relationship (R= 0.6–0.7) with modeled (dVCDBio,GC) Europe, indicating coupling between SIF four domains on scale. Alaska, Siberia dVCDBio,GC both relatively lower variabilities (SIF: CV = 1 %–9 %, dVCDBio,GC: %–2 %; note stands coefficient variation) comparison wildfire-induced (CV 8 %–13 %), suggesting OMI 10 %–16 %) these are likely driven by instead emissions.

Language: Английский

Citations

6
Tree species classification improves the estimation of BVOCs from urban greenspace DOI
Xinxin Bao, Weiqi Zhou,

Weimin Wang

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 914, P. 169762 - 169762

Published: Jan. 2, 2024

Language: Английский

Citations

5
Indoor Volatile Organic Compounds: Concentration Characteristics and Health Risk Analysis on a University Campus DOI Open Access

Shengjia Jin,

Lu Zhong,

Xueyi Zhang

et al.

International Journal of Environmental Research and Public Health, Journal Year: 2023, Volume and Issue: 20(10), P. 5829 - 5829

Published: May 16, 2023

Volatile organic compounds (VOCs) are major indoor air pollutants that contain several toxic substances. However, there few studies on health risk assessments of VOCs in China. This study aimed to determine the concentration characteristics college campuses by collecting VOC samples from different locations campus during seasons combined with exposure times students each location obtained a questionnaire survey assess possible risks. The highest total (254 ± 101 µg/m3) was dormitory. seasonal variation TVOC concentrations related emission sources addition temperature. Health were evaluated using non-carcinogenic and carcinogenic values, represented hazard quotient (HQ) lifetime cancer (LCR), respectively. risks at all sampling sites within safe range (HQ < 1). Dormitories had risk, whereas other three places low (with LCR 1.0 × 10−6). Moreover, 1,2-dichloroethane identified as substance dormitory due its high (1.95 provides basic data basis for formulating measures improve people’s living environments.

Language: Английский

Citations

13