Interdecadal variability of winter precipitation in Northwest China and its association with the North Atlantic SST change

2014 ◽  
Vol 35 (6) ◽  
pp. 1172-1179 ◽  
Author(s):  
Lian-Tong Zhou ◽  
Renguang Wu
Keyword(s):  
North Atlantic ◽  
Northwest China ◽  
Winter Precipitation ◽  
Interdecadal Variability ◽  
The North ◽  
The North Atlantic

scholarly journals Interdecadal Variability of the Warm Arctic and Cold Eurasia Pattern and Its North Atlantic Origin

2018 ◽  
Vol 31 (15) ◽  
pp. 5793-5810 ◽  
Author(s):  
Mi-Kyung Sung ◽  
Seon-Hwa Kim ◽  
Baek-Min Kim ◽  
Yong-Sang Choi
Keyword(s):  
Twentieth Century ◽  
Rossby Wave ◽  
North Atlantic ◽  
Storm Track ◽  
Stationary Wave ◽  
Interdecadal Variability ◽  
Temperature Perturbation ◽  
Mean Flow ◽  
The North ◽  
The North Atlantic

This study investigates the origin of the interdecadal variability in the warm Arctic and cold Eurasia (WACE) pattern, which is defined as the second empirical orthogonal function of surface air temperature (SAT) variability over the Eurasian continent in Northern Hemisphere winter, by analyzing the Twentieth Century Reanalysis dataset. While previous studies highlight recent enhancement of the WACE pattern, ascribing it to anthropogenic warming, the authors found that the WACE pattern has experienced a seemingly periodic interdecadal variation over the twentieth century. This long-term variation in the Eurasian SAT is attributable to the altered coupling between the Siberian high (SH) and intraseasonal Rossby wave emanating from the North Atlantic, as the local wave branch interacts with the SH and consequentially enhances the continental temperature perturbation. It is further identified that these atmospheric circulation changes in Eurasia are largely controlled by the decadal amplitude modulation of the climatological stationary waves over the North Atlantic region. The altered decadal mean condition of stationary wave components brings changes in local baroclinicity and storm track activity over the North Atlantic, which jointly change the intraseasonal Rossby wave generation and propagation characteristics as well. With simple stationary wave model experiments, the authors confirm how the altered mean flow condition in the North Atlantic acts as a source for the growth of the Rossby wave that leads to the change in the downstream WACE pattern.

Analysis of the Dominant Spatial Patterns of Summer Precipitation and Circulation Characteristics in Northwest China

2020 ◽  
Author(s):  
liwei liu ◽  
guoyang lu ◽  
dong wei ◽  
danhua li ◽  
xing wang ◽  
...  
Keyword(s):  
North Atlantic ◽  
Summer Precipitation ◽  
Summer Rainfall ◽  
Northwest China ◽  
Diagnostic Methods ◽  
Height Field ◽  
Main Mode ◽  
The North ◽  
Circulation Characteristic ◽  
The North Atlantic

<p>In recent years, the summer rainfall shows an increasing trend in Northwest China. Based on the NCEP/NCAR reanalysis data, the RESST data from NOAA and the precipitation data from 351 meteorological observation stations in Northwest China from 1981-2018, the dominant modes of summer precipitation anomalies, the corresponded circulation characteristic and the main influence systems were analyzed by diagnostic methods. There were three dominant EOF modes about summer rainfall, the first one showed the same anomaly in whole region, the second showed a inverse pattern between the east and west, and the third showed the opposite anomaly between the south and north. The variance contribution of the first mode accounted for 20% and the first mode was represented as the primary mode in the subsequent analysis. The high impact region of circulation which affected the precipitation in Northwest China was the middle and high latitudes area of Eurasia and the subtropical area: for the first mode’s positive phase, the 500hPa height field showed a "+ - +" distribution in the middle latitude of Eurasia, while on the 200hPa wind field, there was an anticyclone near the Ural and a cyclone near Lake Baikal, it also has an anticyclone on the Chinese mainland, this configuration will facilitates the strengthening of westerly jets. The tropical Pacific and the North Atlantic are the main external forcing signals of the circulation pattern: SST characteristics showed that the negative phase of the North Atlantic SST Tripole in spring, from winter of the previous year to summer of the current year, SST of the equatorial Middle East Pacific developed from warm to cold. The distribution of 500 hPa height field corresponding to the main mode of summer precipitation in Northwest China is similar to that of EU remote correlation type. An index(I<sub>Hgt</sub>) was defined to reflect circulation patterns in mid-latitude and subtropical regions, when the index is positive/negative, most of the precipitation in northwest China is more/less. After 2000, the correlation between the two increased significantly. Given the performance of the I<sub>Hgt</sub> index in describing the summer precipitation, it could be used as a good indicator in the monitoring and prediction of the summer precipitation in Northwest China.</p>

Interdecadal variability in an idealized model of the North Atlantic

1994 ◽  
Vol 99 (C6) ◽  
pp. 12423 ◽  
Author(s):  
Andrew J. Weaver ◽  
Stella M. Aura ◽  
Paul G. Myers
Keyword(s):  
North Atlantic ◽  
Interdecadal Variability ◽  
Idealized Model ◽  
The North ◽  
The North Atlantic

Recent interdecadal shift in the relationship between Northeast China’s winter precipitation and the North Atlantic and Indian Oceans

2017 ◽  
Vol 50 (3-4) ◽  
pp. 1413-1424 ◽  
Author(s):  
Han Tingting ◽  
He Shengping ◽  
Hao Xin ◽  
Wang Huijun
Keyword(s):  
North Atlantic ◽  
Winter Precipitation ◽  
The North ◽  
Interdecadal Shift ◽  
The North Atlantic ◽  
The Relationship

scholarly journals Freshwater pearl mussels from northern Sweden serve as long-term, high-resolution stream water isotope recorders

2019 ◽  
Author(s):  
Bernd R. Schöne ◽  
Aliona E. Meret ◽  
Sven M. Baier ◽  
Jens Fiebig ◽  
Jan Esper ◽  
...  
Keyword(s):  
High Resolution ◽  
Carbon Isotope ◽  
Temporal Resolution ◽  
North Atlantic ◽  
Stream Water ◽  
Winter Precipitation ◽  
The Arctic ◽  
Isotope Signature ◽  
The North ◽  
The North Atlantic

Abstract. The stable isotope composition of lacustrine sediments is routinely used to infer Late Holocene changes in precipitation over Scandinavia and ultimately, atmospheric circulation dynamics in the North Atlantic realm. However, such archives provide only low temporal resolution (ca. 15 years) precluding the ability to identify changes on inter-annual and quasi-decadal time-scales. Here we present a new, high-resolution reconstruction using shells of freshwater pearl mussels, Margaritifera margaritifera, from three rivers in north Sweden. We present seasonally to annually resolved, calendar-aligned stable oxygen and carbon isotope data from ten specimens covering the time interval of 1819 to 1998. The studied bivalves formed their shells near equilibrium with the oxygen isotope signature of ambient water and thus reflected hydrological processes in the catchment as well as changes, albeit damped, of the isotope value of local atmospheric precipitation. Shell oxygen isotopes were correlated significantly with the North Atlantic Oscillation index (up to 56 % explained variability) suggesting that moisture from which winter precipitation formed originated predominantly in the North Atlantic during NAO+ years, but in the Arctic during NAO– years. The specific isotope signature of winter precipitation was damped in stream water and this effect was recorded by the shells. Shell stable carbon isotope values did not show consistent ontogenetic trends, but rather oscillated around an average that differed slightly among the studied rivers (ca. −12.00 to −13.00 ‰). Results of this study contribute to an improved understanding of climate dynamics in Scandinavia and the North Atlantic sector and can help to constrain ecological changes in riverine ecosystems. Moreover, long isotope records of precipitation and streamflow are pivotal for improving our understanding and modeling of hydrological, ecological, biogeochemical and atmospheric processes. Our new approach offers a much higher temporal resolution and superior dating control than existing archives.

Sign in / Sign up

Export Citation Format

Share Document