Sentences with phrase «observational climate data»

Earlier in my career I worked on climate change and desertification in Africa, the development of global and national observational climate data sets and the evaluation of climate models.

Climate models typically do not use any observational climate data such as surface temperature observations.

The Bureau's use of statistical tests that are most likely to identify artificial discontinuities in the temperature data, and how they should be applied, are informed by well - established studies on observational climate data.

Research by tree - ring scientist Laia Andreu - Hayles will provide much - needed observational climate data for Bolivia and Peru and insight into the climate sensitivity of tropical tree species in the Andes.

Observational climate data also showed that sea surface temperatures in the Pacific Ocean have a significant influence on summer air temperatures in the eastern U.S.

Climate scenarios based on model estimates of future climate can be constructed either by adopting the direct model outputs or by combining model estimates of the changed climate with observational climate data.

As mentioned above, climate scenarios that are developed for impacts applications usually require that some estimate of climate change be combined with baseline observational climate data, and the demand for more complete and sophisticated observational data sets of climate has grown in recent years.

I am a climate scientist and have spent much of my career with my head buried in climate model output and observational climate data, trying to tease out the signal of human - caused climate change.

Not exact matches

Using the Great Barrier Reef as their study case, they estimated the evolution of the region over the last 14,000 years and showed that (1) high sediment loads from catchments erosion prevented coral growth during the early phase of sea level rise and favoured deep offshore sediment deposition; (2) how the fine balance between climate, sea level, and margin physiography enabled coral reefs to thrive under limited shelf sedimentation rates at 6,000 years before present; and, (3) how over the last 3,000 years, the decrease of accommodation space led to the lateral extension of coral reefs consistent with available observational data.

«Much of our historical data about species» population - level responses to climate change comes from observational studies, which can suggest but not confirm causation,» said Anne Marie Panetta, lead author of the study and a post-doctoral researcher in CU Boulder's Department of Ecology and Evolutionary Biology (EBIO).

Observed Climate Changes The many new or improved observational data sets that became available in time for the 2007 IPCC report allowed a more comprehensive assessment of changes than was possible in earlier reports.

Allen's team analyzed IPCC AR5 (5th Assessment Report) climate models, several observational and reanalysis data sets, and conducted their own climate model experiments to quantify tropical widening, and to isolate the main cause.

The paper (DOI 10.1038 / ngeo2957), published May 29 in Nature Geoscience, is the first to look at biosphere - atmosphere interactions using purely observational data and could greatly improve weather and climate predictions critical to crop management, food security, water supplies, droughts, and heat waves.

The project, called Estimating the Circulation and Climate of the Ocean (ECCO), uses observational data — including ocean surface topography, surface wind stress, temperature, salinity profiles and velocity data — collected between June 2005 and December 2007.

Leal said the revised conceptual framework, along with a greater emphasis on collecting observational data in the field, will both help to better predict and mitigate the effects of climate change on these vulnerable animals.

Climate modeling and observational data suggest the world is already on track to reach dangerous levels of warming by the end of the century, according to the two papers.

To find out, atmospheric experts at Pacific Northwest National Laboratory compared six reanalyses products against observational data from the U.S. Department of Energy's Atmospheric Radiation Measurement (ARM) Climate Research Facility in Oklahoma.

Methods: Researchers Drs. Samson M. Hagos and L. Ruby Leung, atmospheric scientists at PNNL, surveyed tropical divergence in three global climate models, three global reanalyses (models corrected with observational data), and four sets of field campaign soundings.

Their goal was to improve climate modeling of the MJO and authenticate results using observational data.

A decade of observational data was collected at the ARM Climate Research Facility Southern Great Plains site in Oklahoma.

To meet this societal need, the world climate research community is challenged by underlying science questions and the quality and coverage of the observational data that are used to monitor and understand extremes.

As part of the World Weather Attribution (WWA) team CPDN scientists have looked at observational data and model simulations, including weather@home to identify whether and to what extend human - induced climate change influenced the likelihood and magnitude of this extreme event.

The ongoing heat wave dominating a large swath of Europe is being exacerbated by climate change, according to a new analysis by a team of international scientists using both observational data and climate models.

The IPCC AR4 (9.6: Observational Constraints on Climate Sensitivity) lists 13 studies (Table 9.3) that constrain climate sensitivity using various types of data, including two using LGClimate Sensitivity) lists 13 studies (Table 9.3) that constrain climate sensitivity using various types of data, including two using LGclimate sensitivity using various types of data, including two using LGM data.

The ARM Aerosol Measurement Science Group (AMSG) coordinates ARM Climate Research Facility observations of aerosols and atmospheric trace gases with user needs to ensure advanced, well - characterized observational measurements and data products — at the spatial and temporal scales necessary — for improving climate science and model forClimate Research Facility observations of aerosols and atmospheric trace gases with user needs to ensure advanced, well - characterized observational measurements and data products — at the spatial and temporal scales necessary — for improving climate science and model forclimate science and model forecasts.

The visualization covers the period June 2005 to December 2007 and is based on a synthesis of a numerical model with observational data, created by a NASA project called Estimating the Circulation and Climate of the Ocean, or ECCO for short.

We have neither long enough nor good enough observational data to have a perfect knowledge of the extremes of heat waves given a steady climate, and so no claim along these lines can ever be for 100 % causation, but the change is large enough to be classically «highly significant».

This is similar to how the denier claims of no global warming, or of no anthropogenic influence upon warming, or of low climate sensitivity, depend on all observational data being wrong in the same direction.

Mike's work, like that of previous award winners, is diverse, and includes pioneering and highly cited work in time series analysis (an elegant use of Thomson's multitaper spectral analysis approach to detect spatiotemporal oscillations in the climate record and methods for smoothing temporal data), decadal climate variability (the term «Atlantic Multidecadal Oscillation» or «AMO» was coined by Mike in an interview with Science's Richard Kerr about a paper he had published with Tom Delworth of GFDL showing evidence in both climate model simulations and observational data for a 50 - 70 year oscillation in the climate system; significantly Mike also published work with Kerry Emanuel in 2006 showing that the AMO concept has been overstated as regards its role in 20th century tropical Atlantic SST changes, a finding recently reaffirmed by a study published in Nature), in showing how changes in radiative forcing from volcanoes can affect ENSO, in examining the role of solar variations in explaining the pattern of the Medieval Climate Anomaly and Little Ice Age, the relationship between the climate changes of past centuries and phenomena such as Atlantic tropical cyclones and global sea level, and even a bit of work in atmospheric chemistry (an analysis of beryllium - 7 measureclimate record and methods for smoothing temporal data), decadal climate variability (the term «Atlantic Multidecadal Oscillation» or «AMO» was coined by Mike in an interview with Science's Richard Kerr about a paper he had published with Tom Delworth of GFDL showing evidence in both climate model simulations and observational data for a 50 - 70 year oscillation in the climate system; significantly Mike also published work with Kerry Emanuel in 2006 showing that the AMO concept has been overstated as regards its role in 20th century tropical Atlantic SST changes, a finding recently reaffirmed by a study published in Nature), in showing how changes in radiative forcing from volcanoes can affect ENSO, in examining the role of solar variations in explaining the pattern of the Medieval Climate Anomaly and Little Ice Age, the relationship between the climate changes of past centuries and phenomena such as Atlantic tropical cyclones and global sea level, and even a bit of work in atmospheric chemistry (an analysis of beryllium - 7 measureclimate variability (the term «Atlantic Multidecadal Oscillation» or «AMO» was coined by Mike in an interview with Science's Richard Kerr about a paper he had published with Tom Delworth of GFDL showing evidence in both climate model simulations and observational data for a 50 - 70 year oscillation in the climate system; significantly Mike also published work with Kerry Emanuel in 2006 showing that the AMO concept has been overstated as regards its role in 20th century tropical Atlantic SST changes, a finding recently reaffirmed by a study published in Nature), in showing how changes in radiative forcing from volcanoes can affect ENSO, in examining the role of solar variations in explaining the pattern of the Medieval Climate Anomaly and Little Ice Age, the relationship between the climate changes of past centuries and phenomena such as Atlantic tropical cyclones and global sea level, and even a bit of work in atmospheric chemistry (an analysis of beryllium - 7 measureclimate model simulations and observational data for a 50 - 70 year oscillation in the climate system; significantly Mike also published work with Kerry Emanuel in 2006 showing that the AMO concept has been overstated as regards its role in 20th century tropical Atlantic SST changes, a finding recently reaffirmed by a study published in Nature), in showing how changes in radiative forcing from volcanoes can affect ENSO, in examining the role of solar variations in explaining the pattern of the Medieval Climate Anomaly and Little Ice Age, the relationship between the climate changes of past centuries and phenomena such as Atlantic tropical cyclones and global sea level, and even a bit of work in atmospheric chemistry (an analysis of beryllium - 7 measureclimate system; significantly Mike also published work with Kerry Emanuel in 2006 showing that the AMO concept has been overstated as regards its role in 20th century tropical Atlantic SST changes, a finding recently reaffirmed by a study published in Nature), in showing how changes in radiative forcing from volcanoes can affect ENSO, in examining the role of solar variations in explaining the pattern of the Medieval Climate Anomaly and Little Ice Age, the relationship between the climate changes of past centuries and phenomena such as Atlantic tropical cyclones and global sea level, and even a bit of work in atmospheric chemistry (an analysis of beryllium - 7 measureClimate Anomaly and Little Ice Age, the relationship between the climate changes of past centuries and phenomena such as Atlantic tropical cyclones and global sea level, and even a bit of work in atmospheric chemistry (an analysis of beryllium - 7 measureclimate changes of past centuries and phenomena such as Atlantic tropical cyclones and global sea level, and even a bit of work in atmospheric chemistry (an analysis of beryllium - 7 measurements).

Two climate sensitivity stories this week — both related to how careful you need to be before you can infer constraints from observational data.

There are limited observational data to start with, insufficient testing of climate model simulations of extremes, and (so far) limited assessment of model projections.

Here we analyze a series of climate model experiments along with observational data to show that the recent warming trend in Atlantic sea surface temperature and the corresponding trans - basin displacements of the main atmospheric pressure centers were key drivers of the observed Walker circulation intensification, eastern Pacific cooling, North American rainfall trends and western Pacific sea - level rise.

Part of the story here is that it is this very sort of very careful work done by John Kennedy and Phil Jones and other colleagues working on these datasets that has allowed us to start challenging the models and our understanding in such a detailed way — in some ways it is quite remarkable that the observational data is now good enough to identify this level of detail in how the climate varies and changes.

A series of sensitivity tests show that our detection results are robust to observational data coverage change, interpolation methods, influence of natural climate variability on observations, and different model sampling (see Supplementary Information).

As noted in that post, RealClimate defines the Atlantic Multidecadal Oscillation («AMO») as, «A multidecadal (50 - 80 year timescale) pattern of North Atlantic ocean - atmosphere variability whose existence has been argued for based on statistical analyses of observational and proxy climate data, and coupled Atmosphere - Ocean General Circulation Model («AOGCM») simulations.

Using the SFZ 2008 tar file archive data in combination with the deep - ocean diagnostic model and control - run data used in SFZ 2008, and a deep - ocean diagnostic observational trend calculated from the Levitus et al 2005 dataset, I can produce broadly similar climate parameter PDFs to those in the Forest 2006 main results (Figure 2: GSOLSV, κsfc = 16, uniform prior), with a peak climate sensitivity around S = 3.

In the process, Spencer and Braswell excluded the three of the climate model runs which best matched the observational data, and also cherrypicked the data set furthest from the model runs (HadCRUT)(Figure 1).

The story concerns a recent paper by Andrew Dessler that discusses the issue of extracting values for climate feedbacks from observational data, and which reflects apparently an ongoing argument between Dessler and Roy Spencer over this issue.

Indeed, for over three - quarters of the ocean diffusivity range, the SFZ 2008 model data matches the five decades of observational data as well at the maximum climate sensitivity of S = 10 used in Forest 2006 as it does at S = 3, which is very odd.

In this work, we use a standard linear definition of climate sensitivity, which we state here, and go on to show how it can be derived from observational data.»

Most climate model simulations show a larger warming in the tropical troposphere than is found in observational data sets (e.g., McKitrick et al., 2010; Santer et al., 2013).

I'll bet my house on little green Martians arriving and asking to be taken to see Chris Monckton before I'll expect any climate modellers to give a t ** s about observational data.

b) when used with the HadCM2 - derived surface control data covariance matrix from the SFZ 2008 data, which I have largely been able to agree to raw data from the HadCM2 AOGCM control run (which data Dr Forest has confirmed was used for the Forest 2006 main results), the CSF 2005 surface model and observational data produces, irrespective of which upper air and deep - ocean dataset is used, a strongly peaked PDF for climate sensitivity, centred close to S = 1, not S = 3 as per Forest 2006.

In one fell swoop, Dessler has demonstrated that the only two modern papers arguing for low climate sensitivity are both fundamentally flawed, and their assumptions are contradicted by observational data.

Both observational data and statistically downscaled global climate model output were used and the regions chosen were the Salmon and Willow headwater sub-basins in the Fraser River, in British Columbia.

He analyzes observational data to see how the climate system is changing, and uses observational data to assess climate model performance.

The ongoing heat wave dominating a large swath of Europe is being exacerbated by climate change, according to a new analysis by a team of international scientists using both observational data and climate models.

«Warming of the oceans... affecting... large - scale climate patterns... however, due to the long time scales of ocean dynamics... and the relatively short length of observational data... the effects of those changes on catastrophic risk... unclear.»

Whilst I failed to persuade GRL to require Forest to provide any verifiable data or computer code, he had a change of heart — perhaps prompted by the negative publicity at Climate Etc — and a month later archived the complete code used for Forest 2006, along with semi-processed versions of the relevant MIT model, observational and AO - GCM control run data — the raw MIT model run data having been lost.

Patrick Brown and Ken Caldeira of the Carnegie Institution for Science say incorporating observational data of «Earth's top - of - atmosphere energy budget» shows the «warming projection for the end of the twenty - first century for the steepest radiative forcing scenario is about 15 per cent warmer (+0.5 degrees Celsius)... relative to the raw model projections reported by the Intergovernmental Panel on Climate Change.»