Dataset Open Access

Understanding ENSO dynamics through the exploration of past climates

Phipps, Steven J.; Brown, Jaclyn N.

The palaeoclimate record shows that significant changes in ENSO characteristics took place during the Holocene. Exploring these changes, using both data and models, provides a means of understanding ENSO dynamics. Previous modelling studies have suggested a mechanism whereby changes in the Earth’s orbital geometry explain the strengthening of ENSO over the Holocene. Decreasing summer insolation over the Asian landmass resulted in a weakening of the Asian monsoon system. This led to a weakening of the easterly trade winds in the western Pacific, creating conditions more favourable for El Niño development. To explore this hypothesised forcing mechanism, we use a climate system model to conduct a suite of simulations of the climate of the past 8,000 years. In the early Holocene, we find that the Asian summer monsoon system is intensified, resulting in an amplification of the easterly trade winds in the western Pacific. The stronger trade winds represent a barrier to the eastward propagation of westerly wind bursts, therefore inhibiting the onset of El Niño events. The fundamental behaviour of ENSO remains unchanged, with the major change over the Holocene being the influence of the background state of the Pacific on the susceptibility of the ocean to the initiation of El Niño events.

Files (24.8 GB)
Name Size
psl_0ka.nc
md5:a6f0f8e50d23e5e6d240f089d6cdb406
172.1 MB Download
psl_1ka.nc
md5:c74d753084c989d16ff31164a3153da0
172.1 MB Download
psl_2ka.nc
md5:76062b04f6c446ab56161e2b69e76b40
172.1 MB Download
psl_3ka.nc
md5:663f2ebf3c527f8cf730951bcd61d874
172.1 MB Download
psl_4ka.nc
md5:05d5706f9937ce44b629ee61e1931921
172.1 MB Download
psl_5ka.nc
md5:05f5564a7ce6fb3aab510442aee06a3d
172.1 MB Download
psl_6ka.nc
md5:8653d992ed46a25afa07f343254035d2
172.1 MB Download
psl_7ka.nc
md5:c376149a547f41023b84e032653b9c3d
172.1 MB Download
psl_8ka.nc
md5:0d70f47f917ffcc2812110f19034dc50
172.1 MB Download
README.txt
md5:8c0d3ec21d0ed8a323714b3a10ed7ff4
1.9 kB Download
sftlf_A_FX_pmip2_0k_oa_CSIRO-Mk3L-1.1.nc
md5:402f9c9c7c2b335615ee465216b3f620
19.5 kB Download
sst_0ka.nc
md5:4c326be7aff5167497efde4cc554fa89
688.2 MB Download
sst_1ka.nc
md5:c3f5cb5842b5dcb6ae889fbe7b4c6811
688.2 MB Download
sst_2ka.nc
md5:e8307829cb7ab4e29c056ec8040546fd
688.2 MB Download
sst_3ka.nc
md5:60b689d7f5e2c6091298b60f41adeeae
688.2 MB Download
sst_4ka.nc
md5:3308b5e5a58354e93fb4ce54afa45fee
688.2 MB Download
sst_5ka.nc
md5:efaae7b8a95cd791fd3e17dd0100cce3
688.2 MB Download
sst_6ka.nc
md5:ae482ce1dd156cfd4012a3d982622371
688.2 MB Download
sst_7ka.nc
md5:22d4b106dcdbda0b04f3c779e011c81c
688.2 MB Download
sst_8ka.nc
md5:809906f009a83fb26cc0f3029f27cec1
688.2 MB Download
tauu_0ka.nc
md5:65cbaa472613e0cb39f488ba297d92eb
688.2 MB Download
tauu_1ka.nc
md5:99b5f2bcc1d10de7df0285cbd652253d
688.2 MB Download
tauu_2ka.nc
md5:c62fbba2dad65631b28cd899d7171876
688.2 MB Download
tauu_3ka.nc
md5:5c94ea9b810d82709de416b13afce9eb
688.2 MB Download
tauu_4ka.nc
md5:4922f8e56097fae53a5139b75837afcc
688.2 MB Download
tauu_5ka.nc
md5:a02f8e929e67ebe69aadea66e8fe8a14
688.2 MB Download
tauu_6ka.nc
md5:e80546e6f8b7603830ee6c965c8885c8
688.2 MB Download
tauu_7ka.nc
md5:92701e3082818300b6b2ae7ac9cc9052
688.2 MB Download
tauu_8ka.nc
md5:022549876ff31bb2efef9934d57358b5
688.2 MB Download
tauv_0ka.nc
md5:68f478b85fa0c50a96ddb811aa6ba8cc
688.2 MB Download
tauv_1ka.nc
md5:cab5c5c3e9b1e7627c9d3e8c41c71eba
688.2 MB Download
tauv_2ka.nc
md5:fb21e58df62bdf6a517cc2a31f3b37f1
688.2 MB Download
tauv_3ka.nc
md5:d797002556cf1faeadfba0a0358b7fba
688.2 MB Download
tauv_4ka.nc
md5:284218c32da8f2175d1fe4d932030aa0
688.2 MB Download
tauv_5ka.nc
md5:2023f254329044f17f1dd738e6ddeeed
688.2 MB Download
tauv_6ka.nc
md5:88e6b0e125d8a4f6041521599564ca08
688.2 MB Download
tauv_7ka.nc
md5:0170ede1d42e5def9bc2b6b16344ed5e
688.2 MB Download
tauv_8ka.nc
md5:ef2e156c5ccd5f9b8121fbd9c7be1baa
688.2 MB Download
tax_0ka.nc
md5:f0da6e010df8e257e5d84afd9779a84e
172.1 MB Download
tax_1ka.nc
md5:e4018e8baff12f10492647e78af9ac9c
172.1 MB Download
tax_2ka.nc
md5:be99a3f8cdec0d51f5e5eea7b8d446ce
172.1 MB Download
tax_3ka.nc
md5:cf427c6442db1c212e693196f6701dbe
172.1 MB Download
tax_4ka.nc
md5:cee2d8e24a1b9602ed9495d686dfa612
172.1 MB Download
tax_5ka.nc
md5:35444d9473cddd27464336d5c471a1e1
172.1 MB Download
tax_6ka.nc
md5:8380465982c16c0c8387dce3dc137f61
172.1 MB Download
tax_7ka.nc
md5:d58ea39655dc36e07fb350fe0872df58
172.1 MB Download
tax_8ka.nc
md5:de06b4e3c6be46d9e1069334505bf33a
172.1 MB Download
tay_0ka.nc
md5:5abf1ced1351fe8437445f1bc965ac43
172.1 MB Download
tay_1ka.nc
md5:fb3eb141aed2349bd4411b2c564983f6
172.1 MB Download
tay_2ka.nc
md5:3d18d1d45e98dffdac0b7cf0811edb94
172.1 MB Download
tay_3ka.nc
md5:9d2a7040b86410fa7fee104f72c85688
172.1 MB Download
tay_4ka.nc
md5:ead9a1331ecfeca0e526344129dda9df
172.1 MB Download
tay_5ka.nc
md5:05c26044436732f145ff6a0c88d04c5c
172.1 MB Download
tay_6ka.nc
md5:3b91daaadddc2ccd7246a66d1eb2b0b4
172.1 MB Download
tay_7ka.nc
md5:a1319f3048f6f3793a9d135d7504a703
172.1 MB Download
tay_8ka.nc
md5:7899f882e5575902f47ca687ecbf7684
172.1 MB Download
tsc_0ka.nc
md5:c4f60235c2b93748d461b2b6b15f1291
172.1 MB Download
tsc_1ka.nc
md5:a6cb7cd3cf645bbf4cdc8dcbb4c31880
172.1 MB Download
tsc_2ka.nc
md5:0d70dc9a991386c52da15f1962e38a4e
172.1 MB Download
tsc_3ka.nc
md5:8816c5a77433f4f887bc21a5bed1dc24
172.1 MB Download
tsc_4ka.nc
md5:290bd437f5d66a2c4aecb4d232dc69c3
172.1 MB Download
tsc_5ka.nc
md5:c19c69088d4d5833f33d863106351c35
172.1 MB Download
tsc_6ka.nc
md5:9e5687eb5f55dd28876563986d0666aa
172.1 MB Download
tsc_7ka.nc
md5:097de3c5aa30850cf69671acc8ab0ba0
172.1 MB Download
tsc_8ka.nc
md5:5f5f3822aecc044ff602576643e0def1
172.1 MB Download
78
158
views
downloads
All versions This version
Views 7878
Downloads 158158
Data volume 59.2 GB59.2 GB
Unique views 6767
Unique downloads 4747

Share

Cite as