我们可以预测哪些环形模式存在在泛大陆的时间吗?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 07 - t01:10:13z //www.hoelymoley.com/feeds/question/11 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/11 9 我们可以预测哪些环形模式存在在泛大陆的时间吗? InquilineKea //www.hoelymoley.com/users/10 2014 - 04 - 15 - t19:31:07z 2014 - 06 - 05 - t08:43:01z < p >的一些示例< a href = " http://www.atmos.colostate.edu/ao/introduction.html " > < / >包括环形模式ENSO,不结盟运动,山姆。< / p > < p >我认为的一个主要的秘密是他们开始形成的。< / p > < p >我只是好奇——我们知道是否这些环形模式存在于古气候,尤其是在泛大陆的时间吗?我们有计算能力来预测吗? < / p > //www.hoelymoley.com/questions/11/-/1074 # 1074 6 由plannapus回答我们可以预测哪些环形模式存在在泛大陆的时间吗? plannapus //www.hoelymoley.com/users/87 2014 - 06 - 04 - t13:45:08z 2014 - 06 - 04 - t13:45:08z < p >既然你问泛大陆时间,我会假设你正在谈论二叠纪(马马从299年到252年)。

We have a good idea of what Permian paleogeography was, a fair idea of how Permian oceans circulated globally (see one of your previous questions), enough data to produce credible models on how was the climate at the time (see e. g. Gibbs et al. 2002), even some idea on what atmospheric circulation (see e. g. Tibor & Montanez 2002) was like during that Period. So in theory i don't see any major hurdles to model these kind of oscillations (keep in mind that i am not a climate model specialist).

Now in my opinion, the big issue would be the data to back the model on, and particularly the time resolution needed to study these kind of oscillations: ENSO, PDO, NAM, SAM etc are annual to decadal oscillations (1-10yr).
A resolution "commonly"-achieved so far in detecting climatic oscillations in the Permian fossil record is for cycles of ca. 20kyr (i. e. 20 000 years; Milankovitch precession cycle). The kind of sedimentation rates and sediment quality needed to be able to record annual layers are extremely rare for such older sediments.

With that in mind, it's not impossible to find such sediments, in fact Anderson (1982) detailed the 260kyr-long continuous, annual varved Castille and Bell Canyon Permian evaporitic Formations, but even in such a high-resolution formation the shorter-length oscillation detected was still at ca. 180yr so way above that of any of the annular modes you mentioned.

References:
Anderon, R. Y., 1982. A long geoclimatic record from the Permian. Journal of Geophysical Research : Oceans, 87: 7285-7294.
Gibbs, M. T., McAllister Rees, P., Kutzbach, J. E., Ziegler, A. M., Behling, P. J., Rowley, D. B., 2002. Simulations of Permian Climate and Comparisons with Climate-Sensitive Sediments. Journal of Geology, 110: 33-55.
Tibor, N. J., Montanez, I. P., 2002. Shifts in late Paleozoic atmospheric circulation over western equatorial Pangea: Insights from pedogenic mineral $\delta^{18}O$ compositions. Geology, 30: 1127-1130.

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