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首页> 外文期刊>Agricultural and Forest Meteorology >Adjustment of annual NEE and ET for the open-path IRGA self-heating correction: magnitude and approximation over a range of climate.
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Adjustment of annual NEE and ET for the open-path IRGA self-heating correction: magnitude and approximation over a range of climate.

机译：调整开放式IRGA自热校正的年度NEE和ET：在一定气候范围内的大小和近似值。

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摘要

The self-heating correction is known to modify open-path eddy covariance estimates of net ecosystem CO2 exchange, typically towards reduced uptake or enhanced emissions, but with a magnitude heretofore not generally documented. We assess the magnitude of this correction to be of order 1 micro mol m-2 s-1 (daytime) for half-hourly fluxes and consistently over 100 g C m-2 for annual integrations, across a tower network (CARBORED-ES) spanning climate zones from Mediterranean temperate to cool alpine. We furthermore examine the sensitivity of the correction to its determining factors. Due to significant diurnal variation, the means of discriminating day versus night can lead to differences of up to several tens of g C m-2 year-1. Since its principal determinants - temperature and wind speed - do not include gas flux data, the annual correction can be estimated using only meteorological data so as to avoid uncertainties introduced when filling gaps in flux data. For fast retro-correction of annual integrations published prior to the recognition of this instrument surface heating effect, the annual impact can be roughly approximated to within 12 g C m-2 year-1 by a linear function of mean annual temperature. These determinations highlight the need for the flux community to reach a consensus regarding the need for and the specific form of this correction.
机译：已知自加热校正会修改生态系统净CO 2 交换的开路涡流协方差估计，通常朝着减少吸收或增加排放的方向发展，但其幅度迄今未见文献记载。对于半小时通量，我们估计该校正的量级为1 micro mol m -2 s -1 （白天），并且始终超过100 g C m < sup> -2 ，用于跨塔架网络（CARBORED-ES）的年度集成，该塔架网络覆盖从地中海温带到凉爽高山的气候区域。我们还检查了校正对其决定因素的敏感性。由于昼夜差异很大，因此区分白天和夜晚的方式可能会导致多达数十克C m -2 年 -1 的差异。由于其主要决定因素-温度和风速-不包括气体通量数据，因此可以仅使用气象数据来估算年度修正值，以避免在填充通量数据中的空白时引入不确定性。对于在确认该仪器表面加热效应之前发布的年度积分的快速逆校正，可以将年度影响大致估算在12 g C m -2 year -1 通过年平均温度的线性函数。这些确定突显了通量界需要就这种校正的必要性和具体形式达成共识。

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