The transient sensitivity of sea level rise Ocean Science DOI 10.5194/os-17-181-2021 18 February 2021 Here, we introduce a similar metric for sea level response. We find that future projections estimated on climate model responses fall below extrapolation based on recent observational records.This comparison suggests that the likely upper level of sea level projections in recent IPCC reports would be too low. Read more
Coordinating an operational data distribution network for CMIP6 data Geoscientific Model Development DOI 10.5194/gmd-14-629-2021 17 February 2021 The distribution of data contributed to the Coupled Model Intercomparison Project Phase 6 (CMIP6) is via the Earth System Grid Federation (ESGF). The ESGF is a network of internationally distributed sites that together work as a federated data archive. Read more
Greenland climate simulations show high Eemian surface meltwhich could explain reduced total air content in ice cores Climate of the Past DOI 10.5194/cp-17-317-2021 16 February 2021 This study presents simulations of Greenland surface melt for the Eemian interglacial period (∼130,000 to 115, 000 years ago) derived from regional climate simulations with a coupled surface energy balance model. Read more
The Eocene–Oligocene transition: a review of marine and terrestrial proxy data, models and model–data comparisons Climate of the Past DOI 10.5194/cp-17-269-2021 15 February 2021 We find that CO2 forcing involving a large decrease in CO2 of ca. 40 % (∼325 ppm drop) provides the best fit to the available proxy evidence,with ice sheet and palaeogeographic changes playing a secondary role. Read more
Macroscopic water vapor diffusion is not enhanced in snow The Cryosphere DOI 10.5194/tc-15-389-2021 12 February 2021 Here we show using theory and numerical simulations of idealized and measured snow microstructures that, although sublimation and deposition of water vapor onto snow crystal surfaces do enhance microscopic diffusion in the pore space, this effect is more than countered by the restriction of diffusion space due to ice. Read more
Experiments on magnetic interference for a portable airborne magnetometry system using a hybrid unmanned aerial vehicle (UAV) Geoscientific Instrumentation, Methods and Data Systems DOI 10.5194/gi-10-25-2021 11 February 2021 An experiment concerning the static magnetic interference of the UAV was conducted to assess the severity of the interference of a hybrid vertical take-off and landing (VTOL) UAV. UAV)">Read more
Last Glacial Maximum (LGM) climate forcing and ocean dynamical feedback and their implications for estimating climate sensitivity Climate of the Past DOI 10.5194/cp-17-253-2021 10 February 2021 Here we conduct a suite of Last Glacial Maximum (LGM) simulations using the Community Earth System Model version 1.2 (CESM1.2) to quantify the forcing and efficacy of land ice sheets (LISs) and greenhouse gases (GHGs) in order to estimate equilibrium climate sensitivity. LGM) climate forcing and ocean dynamical feedback and their implications for estimating climate sensitivity">Read more
Review article: Earth’s ice imbalance The Cryosphere DOI 10.5194/tc-15-233-2021 9 February 2021 We combine satellite observations and numerical models to show that Earth lost 28 trillion tonnes of ice between 1994 and 2017. Read more
A methodology for attributing the role of climate change in extreme events: a global spectrally nudged storyline Natural Hazards and Earth System Sciences DOI 10.5194/nhess-21-171-2021 8 February 2021 Extreme weather events are generally associated with unusual dynamical conditions, yet the signal-to-noise ratio of the dynamical aspects of climate change that are relevant to extremes appears to be small, and the nature of the change can be highly uncertain. Read more
Opinion: Cloud-phase climate feedback and the importance of ice-nucleatingparticles Atmospheric Chemistry and Physics DOI 10.5194/acp-21-665-2021 5 February 2021 Shallow clouds covering vast areas of the world’s middle- and high-latitude oceans play a key role in dampening the global temperaturerise associated with CO2. These clouds, which contain both ice andsupercooled water, respond to a warming world by transitioning to a statewith more liquid water and a greater albedo, resulting in a negative“cloud-phase” climate feedback component. Here we argue that the magnitudeof the negative cloud-phase feedback component depends on the amount andnature of the small fraction of aerosol particles that can nucleate icecrystals. We propose that a concerted research effort is required to reducesubstantial uncertainties related to the poorly understoodsources, concentration, seasonal cycles and nature of these ice-nucleatingparticles (INPs) and their rudimentary treatment in climate models. Thetopic is important because many climate models may have overestimated themagnitude of the cloud-phase feedback, and those with better representationof shallow oceanic clouds predict a substantially larger climate warming. Wemake the case that understanding the present-day INP population in shallowclouds in the cold sector of cyclone systems is particularly critical fordefining present-day cloud phase and therefore how the clouds respond towarming. We also need to develop a predictive capability for future INPemissions and sinks in a warmer world with less ice and snow and potentiallystronger INP sources. Read more
