Strong links between teleconnections and ecosystem exchange found at a Pacific Northwest old‐growth forest from flux tower and MODIS EVI data

Wharton, Sonia; Chasmer, L.; Falk, Matthias; U, Kyaw Tha Paw

doi:10.1111/j.1365-2486.2009.01952.x

Cited by 15 publications

(12 citation statements)

References 84 publications

(119 reference statements)

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“…In addition, we should be aware that long‐term land carbon fluxes simulated by state‐of‐the‐art DGVMs still have notable uncertainties due to parameterization and structure deficiencies in the ecosystem models, even if the ensemble of nine individual ecosystem models allows characterization of model spread. The development of flux tower measuring carbon fluxes allows us to bring independent data‐driven CO 2 flux estimates to study the relationships between teleconnections and carbon fluxes and compare them with those obtained from ecosystem models [ Desai et al ., ; Wharton et al ., ]. We thus calculated global and regional correlations between teleconnections and CO 2 fluxes based on the extrapolation of flux tower measurements using machine‐learning algorithms from the FLUXCOM project for the period 1982–2012 [ Jung et al ., ] and compared them to that of the TRENDY modelled fluxes.…”

Section: Resultsmentioning

confidence: 99%

The effects of teleconnections on carbon fluxes of global terrestrial ecosystems

Zhu

Piao

et al. 2017

Geophysical Research Letters

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Large‐scale atmospheric circulation patterns (i.e., teleconnections) influence global climate variability patterns and can be studied to provide a simple framework for relating the complex response of ecosystems to climate. This study analyzes the effects of 15 major teleconnections on terrestrial ecosystem carbon fluxes during 1951–2012 using an ensemble of nine dynamic global vegetation models. We map the global pattern of the dominant teleconnections and find that these teleconnections significantly affect gross primary productivity variations over more than 82.1% of the global vegetated area, through mediating the global temperature and regional precipitation and cloud cover. The El Niño–Southern Oscillation, the Pacific Decadal Oscillation, and the Atlantic Multidecadal Oscillation are strongly correlated with global, hemispherical, and continental carbon fluxes and climatic variables, while the Northern Hemisphere teleconnections have only regional influences. Further research regarding the interactions among the teleconnections and the nonstationarity of the relationship between teleconnections and carbon fluxes is needed.

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Section: Resultsmentioning

confidence: 99%

The effects of teleconnections on carbon fluxes of global terrestrial ecosystems

Zhu

Piao

et al. 2017

Geophysical Research Letters

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“…Several reasons may be responsible for the differences. The large-scale circulation patterns have different effects on climate at the three sites due to their different geographic location (Table 1), and CO 2 exchange responds differentially with respect to latitude and climatic variations [e.g., Nemani et al, 2003;Gong and Ho, 2003;Notaro et al, 2006a;Hember and Lafleur, 2008;Grant et al, 2009;Wharton et al, 2009]. Another possible reason is that the three AmeriFlux research sites have different forest composition species, which affects the response of CO 2 exchange to the climate [e.g., Hadley et al, 2009;Richardson et al, 2009].…”

Section: Application Of the Methodology To Other Sitesmentioning

confidence: 99%

“…[4] Large-scale circulation patterns influence the location and intensity of synoptic atmospheric pressure systems, and thereby significantly modify northern midlatitude climate [e.g., Wallace and Gutzler, 1981;Barnston and Livezey, 1987;Hurrell, 1995Hurrell, , 1996 and ecosystems [e.g., Goldstein et al, 2000;Freedman et al, 2001;Morgenstern et al, 2004;Urbanski et al, 2007;Hember and Lafleur, 2008;Grant et al, 2009;Wharton et al, 2009]. Over the northeast United States, previous studies have demonstrated that the climate and circulation features are strongly influenced by large-scale circulation patterns in the Pacific, Atlantic and Arctic regions.…”

Section: Introductionmentioning

confidence: 99%

Relationships between large-scale circulation patterns and carbon dioxide exchange by a deciduous forest

Zhang

Huang

et al. 2011

J. Geophys. Res.

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[1] In this study, we focus on a deciduous forest in central Massachusetts and investigate the relationships between global climate indices and CO 2 exchange using eddy-covariance flux measurements from 1992 to 2007. Results suggest that large-scale circulation patterns influence the annual CO 2 exchange in the forest through their effects on the local surface climate. Annual gross ecosystem exchange (GEE) in the forest is closely associated with spring El Niño-Southern Oscillation (ENSO) and Pacific Decadal Oscillation (PDO), previous fall Atlantic Multidecadal Oscillation (AMO), and previous winter East Pacific-North Pacific (EP-NP) pattern. Annual net ecosystem exchange (NEE) responds to previous fall AMO and PDO, while annual respiration (R) is impacted by previous fall ENSO and Pacific/North American Oscillation (PNA). Regressions based on these relationships are developed to simulate the annual GEE, NEE, and R. To avoid problems of multicollinearity, we compute a "Composite Index for GEE (CI GEE )" based on a linear combination of spring ENSO and PDO, fall AMO, and winter EP-NP and a "Composite Index for R (CI R )" based on a linear combination of fall ENSO and PNA. CI GEE , CI R , and fall AMO and PDO can explain 41, 27, and 40% of the variance of the annual GEE, R, and NEE, respectively. We further apply the methodology to two other northern midlatitude forests and find that interannual variabilities in NEE of the two forests are largely controlled by large-scale circulation patterns. This study suggests that global climate indices provide the potential for predicting CO 2 exchange variability in the northern midlatitude forests.Citation: Zhang, J., L. Wu, G. Huang, and M. Notaro (2011), Relationships between large-scale circulation patterns and carbon dioxide exchange by a deciduous forest,

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“…For example, the effect of the phase of the El Niño‐Southern Oscillation (ENSO) on global‐scale photosynthesis and respiration, with ramifications for the global atmospheric CO 2 growth rate, has been particularly well studied (e.g., Gloor et al, ; Schwalm et al, ). These oscillations are themselves related to regional variability in multiple meteorological factors that may have additive or interactive effects on ecosystem carbon exchange (e.g., Jones et al, ; Knorr et al, ; Potter et al, ; Wharton et al, ).…”

Section: Introductionmentioning

confidence: 99%

Synoptic Meteorology Explains Temperate Forest Carbon Uptake

2020

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While substantial attention has been paid to the effects of both global climate oscillations and local meteorological conditions on the interannual variability of ecosystem carbon exchange, the relationship between the interannual variability of synoptic meteorology and ecosystem carbon exchange has not been well studied. Here we use a clustering algorithm to identify a summertime cyclonic precipitation system northwest of the Great Lakes to determine (a) the association at a daily scale between the occurrence of this system and the local meteorology and net ecosystem exchange at three Great Lakes region forested eddy covariance sites and (b) the association between the seasonal prevalence of this system and the summertime net ecosystem exchange of these sites. We find that temperature, in addition to precipitation and cloud cover, is an important explanatory factor for the suppression of net ecosystem productivity that occurs during these cyclonic events in this region. In addition, the prevalence of this cyclonic system can explain a significant proportion of the interannual variability in summertime forest ecosystem exchange in this region. This explanatory power is not due to a simple accumulation of low‐productivity days that cooccur with this meteorological event, but rather a broader association between the frequency of these events and several aspects of prevailing seasonal conditions. This work demonstrates the usefulness of conceptualizing meteorology in terms of synoptic systems for explaining the interannual variability of regional carbon fluxes.

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Strong links between teleconnections and ecosystem exchange found at a Pacific Northwest old‐growth forest from flux tower and MODIS EVI data

Cited by 15 publications

References 84 publications

The effects of teleconnections on carbon fluxes of global terrestrial ecosystems

The effects of teleconnections on carbon fluxes of global terrestrial ecosystems

Relationships between large-scale circulation patterns and carbon dioxide exchange by a deciduous forest

Synoptic Meteorology Explains Temperate Forest Carbon Uptake

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