Changes in the metastability of the Southern Hemisphere 500-hPa circulation are examined using both cluster analysis techniques and split-flow blocking indices. The cluster methodology is a purely data-driven approach for parameterization whereby a multiscale approximation to nonstationary dynamical processes is achieved through optimal sequences of locally stationary fast vector autoregressive factor (VARX) processes and some slow (or persistent) hidden process switching between them. Comparison is made with blocking indices commonly used in weather forecasting and climate analysis to identify dynamically relevant metastable regimes in the 500-hPa circulation in both reanalysis and Atmospheric Model Intercomparison Project (AMIP) datasets. The analysis characterizes the metastable regime in both reanalysis and model datasets prior to 1978 as positive and negative phases of a hemispheric midlatitude blocking state with the southern annular mode (SAM) associated with a transition state. Post-1978, the SAM emerges as a true metastable state replacing the negative phase of the hemispheric blocking pattern. The hidden state frequency of occurrences exhibits strong trends. The blocking pattern dominates in the early 1980s, and then gradually decreases. There is a corresponding increase in the SAM frequency of occurrence. This trend is largely evident in the reanalysis summer and spring but was not evident in the AMIP dataset. Further comparison with the split-flow blocking indices reveals a superficial correspondence between the cluster hidden state frequency of occurrences and split-flow indices. Examination of composite states shows that the blocking indices capture splitting of the zonal flow whereas the cluster composites reflect coherent block formation. Differences in blocking climatologies from the respective methods are discussed.
2010-8-31 early in the morning for Baidu game site rankings have done the biggest adjustment ever. We take a look at the screenshot to know what is going on, all of the popular search terms of the game’s search results are in front of the default 7k7k game direct interface. What does this mean? How do other games survive?
this picture is for "single game" the word search results show. There are many other words are true, "double game" "the wing" "Lianliankan" there are a lot of popular words is 7k7k home page display, this move will undoubtedly give 7k7k to bring huge traffic, has so many years is 4399 in game site of the first seat, should now it is time to change dynasties.
the survival of many small game sites are dependent on search engines, and Baidu is the main source. On the current situation, even if a word can be ranked very well on the first place, the amount of Baidu is also minimal.
new era of small game site, this move also highlights the growing importance of Baidu brand, and this will be used in practice. Before the game is related to the public words, are a lot of small game site you earn me to seize the home page that a few seats, you can row up there is traffic, there is income. Not now, if not their own brands, want to rely on these words to the public traffic, it is gone. Like 3839 games, 4399 games, 2144 games, 3366 games, 558 games, etc. such words have a chance to make up, make a brand is easier said than done, without strong financial backing of their own. Difficult, so this time Baidu adjustment, to a lot of small game grassroots webmaster directly off the job.
the end of an old era, is bound to usher in a new era in the process of transformation will inevitably be sacrificed, and this is a small game of the victim, no way. This move is also fully consistent with Baidu’s guidelines – to provide users with the best search results, so we can not blame Baidu for this, and strive to develop their own brands, is the last word!
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