Furthermore, SST variability (Seager et al. 2005, 2008; Meehl and Hu 2006; McCabe et al. 2008), as well as external forcings (Dai 2011, 2013; Coats et al. 2013), may contribute to the low frequency variability and potential decadal - scale predictability
of hydroclimate variability over North America.
«The fact that the drought atlases provide a nearly hemispheric view of
hydroclimate variability provides an incredible amount of information that can be used to better understand what was happening in the atmosphere and ocean,» Coats said.
«By having tree ring - based
hydroclimate reconstructions for three northern hemisphere continents, we can now easily see these patterns and identify the responsible modes of variability.»
«Unfortunately, the geographical coverage of
hydroclimate proxy records is still very limited — or nonexistent — in many parts of the world.»
«It is odd to me to think of century -
scale hydroclimate variability in terms of «extremes», a term typically reserved in climate science for timescales of hours to years.»
The Iso2k effort is currently the only
global hydroclimate database being constructed for the Common Era, and it has strong ties to other archive - and climate target — specific groups within PAGES.
This improvement has allowed GFDL scientists and their collaborators to use this model for innovative studies of
regional hydroclimate change (Doi et al, 2012,2013; Kapnick and Delworth, 2013; Delworth and Zeng, 2014; Kapnick et al., 2014) and ocean circulation (Lee et al, 2013).
The enhanced resolution in the CM2.5 model has a significantly improved simulation of many aspects of climate,
particularly hydroclimate over continental regions (Delworth et al., 2012, Figures 5,6,7 and 9); many of the improvements in simulation of near - surface climate in CM2.5 are recovered in FLOR (e.g., Jia et al. 2015).
Succeeding in the field requires incredible patience combined with the ability to think deeply about how the sparse but growing network of speleothems, combined with other
hydroclimate records, can inform our understanding of past climate dynamics.
«We postulate that these halogen - rich eruptions created a stratospheric ozone hole over Antarctica that, analogous to the modern ozone hole, led to large - scale changes in atmospheric circulation and
hydroclimate throughout the Southern Hemisphere,» he added.
These efforts are also part of Berkeley Lab's Water Resilience Initiative, part of which aims to develop approaches to
predict hydroclimate at scales that can be used to guide water - energy strategies.
«The paper provides a much - needed long - term climate and
hydroclimate context for this region,» says Christopher Still, a climatologist at the University of California, Santa Barbara.
Speleothems — stalagmites, stalactites, flowstones — are a central tool for reconstructing
past hydroclimate variability.
«Therefore, our analysis of
multicentury hydroclimate variability suggests that projections of tropical rainfall patterns, and global temperature extremes, will remain uncertain until paleoclimate records and models consistently capture the lower - frequency variability, and associated feedbacks, in the tropical Pacific.»
Recommendations: The next generation of PAGES 2k climate reconstructions should target reconstructions of
hydroclimate as well as temperature.
Ruiz - Barradas, Alfredo and Sumant Nigam, May 2010: SST — North
American Hydroclimate Links in AMIP Simulations of the Drought Working Group Models: A Proxy for the Idealized Drought Modeling Experiments, Journal of Climate, Vol.
The hemispheric scale adds to the potential uses of what was already the gold standard of paleo -
hydroclimate research, said Sloan Coats, a climate dynamicist at the University of Colorado who studies megadroughts using the atlases.
In light of our findings and its implications, we propose a «warm LIA» scenario for the Southwest, which compounds the effects of warmer temperatures with
higher hydroclimate variability.
How Ice Rafting Events Affect Asian
Monsoon Hydroclimate -LSB-...] The researchers found that the intensity of the Asian summer monsoon decreased rapidly at the start of each Heinrich event, reaching its weakest point within 50 years, followed by gradual intensification.
The 2000 - 2004 dry spell was the worst drought in the region in 800 years, the researchers claim, and before the century is over we'll look back on those days as the wetter end of a much
larger hydroclimate shift.
In view of the potential societal threats, drought conditions in the United States (US) are carefully monitored and considerable efforts are made to
forecast hydroclimate conditions on seasonal timescales (Svoboda et al. 2002; Schubert et al. 2007).
Therefore, decadal hydrological prediction requires an understanding of both the externally forced component and the prediction skill of internally generated
decadal hydroclimate variability.
This long simulation enables us to identify the leading patterns of decadal - to -
multidecadal hydroclimate variability over North America.
Our study revealed that the stochastic climate model concept of a 1st order linear Markov process (Hasselmann 1976; Delworth and Manabe 1988) can be successfully applied to understand first order decadal variability and predictability of
hydroclimate variations across North America.
This work is supported through NSF Award No. 1049219, Investigation of Decadal Climate Predictability and
Hydroclimate impacts (IDCPI) on the Western US.
Individual records from caves and other paleo -
hydroclimate proxies have implied that simultaneous drying of the Northern tropics and wetting of the Southern tropics followed Heinrich events, consistent with southward shifts of the tropical rain belts and the thermal equator.
The main goal of Iso2k is to identify regional - and global - scale features in Common
Era hydroclimate and atmospheric circulation and then assess possible relationships with temperature reconstructions [PAGES 2k Consortium, 2013, 2017; Tierney et al., 2015; McGregor et al., 2015; Abram et al., 2016].