Based on a simulation using a newly developed climate system model(Chinese Academy of Sciences-Earth System Model-Climate system component, CAS-ESM-C), the author investigated the Aleutian Low- Icelandic Low Seesaw(AI...Based on a simulation using a newly developed climate system model(Chinese Academy of Sciences-Earth System Model-Climate system component, CAS-ESM-C), the author investigated the Aleutian Low- Icelandic Low Seesaw(AIS) and its decadal variation. Results showed that the CAS-ESM-C can reasonably reproduce not only the spatial distribution of the climatology of sea level pressure(SLP) in winter, but also the AIS and its decadal variation. The period 496–535 of the integration by this model was divided into two sub-periods: 496–515(P1) and 516–535(P2) to further investigate the decadal weakening of the AIS. It was shown that this decadal variation of the AIS is mainly due to the phase transition of the Pacific Decadal Oscillation(PDO), from its positive phase to its negative phase. This transition of the PDO causes the sea surface temperature(SST) in the equatorial eastern(northern) Pacific to cool(warm), resulting in the decadal weakening of mid-latitude westerlies over the North Pacific and North Atlantic. This may be responsible for the weakening of the inverse relation between the Aleutian Low(AL) and the Icelandic Low(IL).展开更多
The zonal shift of SST warming patterns associated with the eastern Pacific （EP） and central Pacific （CP） El Ni（n）o leads to a significant contrast in MJO strength over the Maritime Continent.The MJO circulation...The zonal shift of SST warming patterns associated with the eastern Pacific （EP） and central Pacific （CP） El Ni（n）o leads to a significant contrast in MJO strength over the Maritime Continent.The MJO circulation tends to be stronger over the Maritime Continent during the mature phase （autumnwinter） of CP El Ni（n）o than of EP El Ni（n）o.Based on a new MJO kinetic energy （KE） budget equation,in which the effects of mean flow and high-frequency disturbances on the MJO are separated,we found that the low-level MJO gains more KE from the background mean flow during CP El Ni（n）o events,although at the same time the enhanced MJO transfers more KE to high-frequency eddies.Among the three-dimensional circulation anomalies,the low-level convergence and cyclonic anomalies associated with upward anomalies of the Walker circulation over the Maritime Continent play leading roles in inducing the enhanced barotropic energy conversion from mean flow to MJO during CP El Ni（n）o events relative to EP El Ni（n）o events.The more vigorous MJO with strengthened vertical motion and heating anomalies at the upper troposphere can maintain its amplitude through the baroclinic energy conversion from the MJO available potential energy to KE.Both the low-tomid tropospheric barotropic energy conversion from mean flow to MJO and upper-level baroclinic energy conversion contribute positively to the enhanced MJO over the Maritime Continent during CP El Ni（n）o years compared to during EP El Ni（n）o years.展开更多
ON April 8,2015 an infantry contingent from China arrived in South Sudan.This was the last batch of the 700-member Chinese infantry battalion designated for UN peacekeeping missions there,China＇s first,marking a new ...ON April 8,2015 an infantry contingent from China arrived in South Sudan.This was the last batch of the 700-member Chinese infantry battalion designated for UN peacekeeping missions there,China＇s first,marking a new stage of its participation in UN peacekeeping deployment.An Active Helper The UN aims to defend peace in the spirit of the UN Charter via peacekeeping operations.China,a permanent展开更多
A sustainable production of electricity is essential for low carbon green growth in South Korea. Although wind energy is unlimited in potential, both intermittency and volatility should be tackled for smart grid integ...A sustainable production of electricity is essential for low carbon green growth in South Korea. Although wind energy is unlimited in potential, both intermittency and volatility should be tackled for smart grid integration in future. To cope with this, many works have been done for wind speed and power forecasting. It is shown that statistical techniques are useful for short-term forecasting of wind power. This paper presents a statistical wind speed forecasting. The wavelet decomposition is employed as a de-noising technique. An illustration will be given by real-world dataset. According to the result, the MAD （mean absolute deviation） is improved as much as 10%.展开更多
Detrended fluctuation analysis （DFA） is fit for studies on the long-range exponential correlation of non-stationary time serial. In this paper, in order to find a hy- poxia adaptability evaluation criterion, the hea...Detrended fluctuation analysis （DFA） is fit for studies on the long-range exponential correlation of non-stationary time serial. In this paper, in order to find a hy- poxia adaptability evaluation criterion, the heart rate and SaO2 signals are analyzed by this method. The demarcate exponent about fit-good-group and fit-bad-group in hy- poxia and normal air are calculated and compared. The result shows a is different in different situation, the α in hypoxia is much higher than α of breath in normal air. And α of fit-good-group is higher than fit-bad-group. It shows that DFA could be a good criterion to analyze hypoxia adaptability, which is useful in the analysis of hypoxia phys- iology signal.展开更多
基金supported by the "Strategic Priority Research Program-Climate Change: Carbon Budget and Related Issues" of the Chinese Academy of Sciences (XDA05110201)the National Basic Research Program of China (2010CB951901)funded by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA05110203)
文摘Based on a simulation using a newly developed climate system model(Chinese Academy of Sciences-Earth System Model-Climate system component, CAS-ESM-C), the author investigated the Aleutian Low- Icelandic Low Seesaw(AIS) and its decadal variation. Results showed that the CAS-ESM-C can reasonably reproduce not only the spatial distribution of the climatology of sea level pressure(SLP) in winter, but also the AIS and its decadal variation. The period 496–535 of the integration by this model was divided into two sub-periods: 496–515(P1) and 516–535(P2) to further investigate the decadal weakening of the AIS. It was shown that this decadal variation of the AIS is mainly due to the phase transition of the Pacific Decadal Oscillation(PDO), from its positive phase to its negative phase. This transition of the PDO causes the sea surface temperature(SST) in the equatorial eastern(northern) Pacific to cool(warm), resulting in the decadal weakening of mid-latitude westerlies over the North Pacific and North Atlantic. This may be responsible for the weakening of the inverse relation between the Aleutian Low(AL) and the Icelandic Low(IL).
基金supported by the National Natural Science Foundation of China[grant number 41375100]the National Basic Research Program of China[973 Program,grant number2015CB453200]the Natural Science Foundation of Jiangsu Province[grant number BK20140046]
文摘The zonal shift of SST warming patterns associated with the eastern Pacific （EP） and central Pacific （CP） El Ni（n）o leads to a significant contrast in MJO strength over the Maritime Continent.The MJO circulation tends to be stronger over the Maritime Continent during the mature phase （autumnwinter） of CP El Ni（n）o than of EP El Ni（n）o.Based on a new MJO kinetic energy （KE） budget equation,in which the effects of mean flow and high-frequency disturbances on the MJO are separated,we found that the low-level MJO gains more KE from the background mean flow during CP El Ni（n）o events,although at the same time the enhanced MJO transfers more KE to high-frequency eddies.Among the three-dimensional circulation anomalies,the low-level convergence and cyclonic anomalies associated with upward anomalies of the Walker circulation over the Maritime Continent play leading roles in inducing the enhanced barotropic energy conversion from mean flow to MJO during CP El Ni（n）o events relative to EP El Ni（n）o events.The more vigorous MJO with strengthened vertical motion and heating anomalies at the upper troposphere can maintain its amplitude through the baroclinic energy conversion from the MJO available potential energy to KE.Both the low-tomid tropospheric barotropic energy conversion from mean flow to MJO and upper-level baroclinic energy conversion contribute positively to the enhanced MJO over the Maritime Continent during CP El Ni（n）o years compared to during EP El Ni（n）o years.
文摘ON April 8,2015 an infantry contingent from China arrived in South Sudan.This was the last batch of the 700-member Chinese infantry battalion designated for UN peacekeeping missions there,China＇s first,marking a new stage of its participation in UN peacekeeping deployment.An Active Helper The UN aims to defend peace in the spirit of the UN Charter via peacekeeping operations.China,a permanent
文摘A sustainable production of electricity is essential for low carbon green growth in South Korea. Although wind energy is unlimited in potential, both intermittency and volatility should be tackled for smart grid integration in future. To cope with this, many works have been done for wind speed and power forecasting. It is shown that statistical techniques are useful for short-term forecasting of wind power. This paper presents a statistical wind speed forecasting. The wavelet decomposition is employed as a de-noising technique. An illustration will be given by real-world dataset. According to the result, the MAD （mean absolute deviation） is improved as much as 10%.
文摘Detrended fluctuation analysis （DFA） is fit for studies on the long-range exponential correlation of non-stationary time serial. In this paper, in order to find a hy- poxia adaptability evaluation criterion, the heart rate and SaO2 signals are analyzed by this method. The demarcate exponent about fit-good-group and fit-bad-group in hy- poxia and normal air are calculated and compared. The result shows a is different in different situation, the α in hypoxia is much higher than α of breath in normal air. And α of fit-good-group is higher than fit-bad-group. It shows that DFA could be a good criterion to analyze hypoxia adaptability, which is useful in the analysis of hypoxia phys- iology signal.
