Greenland temperature and precipitation over the last 20,000 years using data assimilation

  title={Greenland temperature and precipitation over the last 20,000 years using data assimilation},
  author={Jessica A. Badgeley and Eric J. Steig and Gregory J. Hakim and T. J. Fudge},
Reconstructions of past temperature and precipitation are fundamental to modeling the Greenland Ice Sheet and assessing its sensitivity to climate. Paleoclimate information is sourced from proxy records and climate-model simulations; however, the former are spatially incomplete while the latter are sensitive to model dynamics and boundary conditions. Efforts to combine these sources of information to reconstruct spatial patterns of Greenland climate over glacial– interglacial cycles have been… 

Reconstructing Holocene temperatures in time and space using paleoclimate data assimilation

, Abstract. Paleoclimatic records provide valuable information about Holocene climate, revealing aspects of climate variability for a multitude of sites around the world. However, such data also

Abrupt Common Era hydroclimate shifts drive west Greenland ice cap change

Ice core archives are well suited for reconstructing rapid past climate changes at high latitudes. Despite this, few records currently exist from coastal Greenlandic ice caps due to their remote

Reconstructing atmospheric circulation and sea-ice extent in the West Antarctic over the past 200 years using data assimilation

The West Antarctic climate has witnessed large changes during the second half of the twentieth century including a strong and widespread continental warming, important regional changes in sea-ice

Simulating the Holocene deglaciation across a marine-terminating portion of southwestern Greenland in response to marine and atmospheric forcings

Abstract. Numerical simulations of the Greenland Ice Sheet (GrIS) over geologic timescales can greatly improve our knowledge of the critical factors driving GrIS demise during climatically warm

Northern Hemisphere vegetation change drives a Holocene thermal maximum

The Holocene thermal maximum, a period of global warmth evident in early to mid-Holocene proxy reconstructions, is controversial. Most model simulations of the Holocene have not reproduced this

The response of the hydrological cycle to temperature changes in recent and distant climatic history

The relationship between the hydrological cycle and the temperature is rather complex and of great importance to human socioeconomic activities. The prevailing theory suggests that as temperature

Supplementary material to "Using a process-based dendroclimatic proxy system model in a data assimilation framework: a test case in the Southern Hemisphere over the past centuries"

Abstract. Currently available data-assimilation-based reconstructions of past climate variations have only used statistical proxy system models to make the link between climate model outputs and

Past Warmth and Its Impacts During the Holocene Thermal Maximum in Greenland

Higher boreal summer insolation in the early to middle Holocene drove thousands of years of summer warming across the Arctic. Modern-day warming has distinctly different causes, but geologic data

Abrupt Heinrich Stadial 1 cooling missing in Greenland oxygen isotopes

It is suggested that Greenland δ18O may substantially underestimate temperature variability during cold glacial conditions, and the Arctic summer warmed during HS1 and YD because of increased insolation and greenhouse gases, consistent with snowline reconstructions.

The worst is yet to come for the Greenland ice sheet.

Present melt rates are comparable to the highest rates during the Holocene, but future rates will probably exceed them, and the current recession of Greenland’s ice margin is led by the retreat of outlet glaciers.



Climate reconstruction using data assimilation of water isotope ratios from ice cores

Water isotope data from ice cores, particularly δ18O, have long been used in paleoclimatology. Although δ18O has been primarily interpreted as a proxy for local air temperature, isotope‐enabled

Greenland temperature response to climate forcing during the last deglaciation

Old and older, cold and colder Greenland surface air temperatures changed dramatically during the last deglaciation. The exact amount is unknown, which makes it difficult to understand what caused

Volcanic influence on centennial to millennial Holocene Greenland temperature change

It is concluded that volcanic activity played a critical role in driving centennial to millennial-scale Holocene temperature variability in Greenland and likely beyond.

Simulating climate and stable water isotopes during the Last Interglacial using a coupled climate‐isotope model

Understanding the dynamics of warm climate states has gained increasing importance in the face of anthropogenic climate change, and while it is possible to simulate warm interglacial climates, these

Development and evaluation of a system of proxy data assimilation for paleoclimate reconstruction

Abstract. Data assimilation (DA) has been successfully applied in the field of paleoclimatology to reconstruct past climate. However, data reconstructed from proxies have been assimilated, as opposed

Seasonal precipitation timing and ice core records.

Although the analysis for Greenland precipitation over the last century suggests that seasonal effects are a significant component of interannual isotopic variability, general circulation model (GCMs) represent one of the few means of assessing the importance of this phenomenon for interpreting the isotopic record over glacial cycles.

Climate model benchmarking with glacial and mid-Holocene climates

Abstract Past climates provide a test of models’ ability to predict climate change. We present a comprehensive evaluation of state-of-the-art models against Last Glacial Maximum and mid-Holocene

High Arctic Holocene temperature record from the Agassiz ice cap and Greenland ice sheet evolution

The results show that air temperatures in this region are now at their warmest in the past 6,800–7,800 y, and that the recent rate of temperature change is unprecedented over the entire Holocene.

Greenland‐Wide Seasonal Temperatures During the Last Deglaciation

The sensitivity of the Greenland ice sheet to climate forcing is of key importance in assessing its contribution to past and future sea level rise. Surface mass loss occurs during summer, and

Global Evaluation of Proxy System Models for Stable Water Isotopes With Realistic Atmospheric Forcing

Proxy system models (PSMs) are an important bridge between climate simulations and climate records prior to the period where instrumental observations are available. PSMs help to interpret what