Sentences with phrase «evaluated past climate changes»

This study evaluated past climate changes over the previous 65 million years, considering nearly two dozen investigations of many different geological time periods.

Not exact matches

The work of Schmittner et al. demonstrates that climates of the past can provide potentially powerful information to reduce uncertainty in future climate predictions and evaluate the likelihood of climate change that is larger than captured in present models.

[Response: Well the discussion in the TAR is actually very clear about what can be evaluated (current climate conditions and variability, past changes etc.) and the use of GCM projections of possible future climates, and all of the apparently dramatic points made by Crichton are acknowledged and discussed there.

By putting the local climate into the context of the larger picture, analyzing the uncertainties, and evaluating the methods in terms of past changes, I think that local climate projections can provide useful information.

They ran an ensemble of simulations with a climate model of intermediate complexity to evaluate the causes of past climate changes.

NIPCC scientists concluded the IPCC was biased with respect to making future projections of climate change, discerning a significant human - induced influence on current and past climatic trends, and evaluating the impacts of potential carbon dioxide - induced environmental changes on Earth's biosphere.

Evaluating past statistics, the panel concluded that predictable influences on climate made for only relatively small changes.

Given that the past 30 — 50 years is a relatively short period for evaluating long - term trends, the SST trends themselves could be viewed as a manifestation of large - scale modes of multidecadal Pacific variability (e.g. Zhang et al. 1997; Deser et al. 2004) or as part of the century scale positive SST trends associated with climate change (e.g. Deser et al. 2010); it is likely that both multidecadal climate variability and climate change have contributed to the SST trend pattern evident in Fig. 9 and used to force the model.

As the Sun provides an explicit external forcing, a better understanding of its cause and effect in climate change could help us evaluate the importance of other climate forcings (such as past and future greenhouse gas changes).

Models help us interpret past and present climate changes, and, in so far as they succeed in simulating past changes, they provide a tool to help evaluate the impacts of alternative policies that affect climate.

The goal of PAGES» LandCover6k Working Group is to use pollen, archaeological and historical data to provide information on past land cover and land use change that can be used to evaluate and improve Anthropogenic Land - Cover Change (ALCC) scenarios for palaeoclimate modelling and the study of land - use as a climate fochange that can be used to evaluate and improve Anthropogenic Land - Cover Change (ALCC) scenarios for palaeoclimate modelling and the study of land - use as a climate foChange (ALCC) scenarios for palaeoclimate modelling and the study of land - use as a climate forcing.

The climate feedbacks involved with these changes, which are key in understanding the climate system as a whole, include: + the importance of aerosol absorption on climate + the impact of aerosol deposition which affects biology and, hence, emissions of aerosols and aerosol precursors via organic nitrogen, organic phosphorus and iron fertilization + the importance of land use and land use changes on natural and anthropogenic aerosol sources + the SOA sources and impact on climate, with special attention on the impact human activities have on natural SOA formation In order to quantitatively answer such questions I perform simulations of the past, present and future atmospheres, and make comparisons with measurements and remote sensing data, all of which help understand, evaluate and improve the model's parameterizations and performance, and our understanding of the Earth system.