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Research article - Peer-reviewed, 2022

Albedo on cropland: Field-scale effects of current agricultural practices in Northern Europe

Sieber, Petra; Bohme, Sepp; Ericsson, Niclas; Hansson, Per-Anders

Abstract

Agricultural land use and management affect land surface albedo and thus the climate. Increasing the albedo of cropland could enhance reflection of solar radiation, counteracting the radiative forcing (RF) of greenhouse gases (GHGs) and local warming. However, knowledge is lacking on how agricultural practices affect albedo under local conditions, and on the benefits of individual practices. In this study, field measurements were made in 15 paired plots at a site in Northern Europe to determine albedo, net shortwave irradiance and RF impacts under various common crops, cultivation intensities and tillage practices. Field data for 2019-2020 were compared with satellite-based albedo for the surrounding region in 2010-2020. At regional level, different combinations of soil type, yearly weather and agricultural practices led to great variability in the albedo of individual crops, despite similar pedo-climatic conditions. At field level within years, albedo differences were determined mainly by crop type, species-specific phenology and post-harvest management. Annual albedo was higher with perennial ley (0.20-0.22) and winter-sown crops (0.18-0.22) than with spring-sown crops (0.16-0.18) and bare soil (0.13). Barley had the highest albedo among winter and spring cereals. In summer, when increased albedo could alleviate local heat stress, oats reduced net shortwave irradiance at the surface by 0.8-5.8 Wm(-2) compared with other cereals, ley, peas or rapeseed. Delayed or reduced tillage gave high local cooling potential (up to-13.6 Wm(-2)) in late summer. Potential benefits for global mean climate as GWP(100 )per hectare and year reached-980 kg CO(2)e for avoiding black fallow,-578 kg CO(2)e for growing a winter-sown variety and-288 kg CO(2)e for delayed tillage. Thus realistic albedo increases on cropland could have important effects on local temperatures and offset a substantial proportion of the RF deriving from field-scale GHG emissions on short time-scales.

Keywords

Land management; Biophysical; Radiative forcing; Climate impact; LCA; Life cycle assessment

Published in

Agricultural and Forest Meteorology
2022, volume: 321
Publisher: ELSEVIER

Authors' information

Swedish University of Agricultural Sciences, Department of Energy and Technology
Swedish University of Agricultural Sciences, Department of Energy and Technology
Swedish University of Agricultural Sciences, Department of Energy and Technology
Swedish University of Agricultural Sciences, Department of Energy and Technology

Associated SLU-program

STandUP for Energy

Sustainable Development Goals

SDG13 Climate action
SDG12 Ensure sustainable consumption and production patterns

UKÄ Subject classification

Environmental Sciences
Environmental Sciences related to Agriculture and Land-use
Other Environmental Engineering

Publication Identifiers

DOI: https://doi.org/10.1016/j.agrformet.2022.108978

URI (permanent link to this page)

https://res.slu.se/id/publ/117386