410 ka weak monsoon event recorded by stalagmites in Jinfo Cave of Chongqing
doi: 10.11932/karst20240201
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Abstract: The freshwater discharge from melting ice sheets in the deglaciation or glaciation is prone to anomalies in ocean−atmosphere transport between different latitudes, which can lead to a series of abrupt millennial-scale climate events, either obvious or not, such as the Younger Dryas (YD) events and YD-like events. Marine Isotope Stage 11c (MIS 11c) serves as one of the best references for the current Holocene, and the studies of possible YD-like events and their triggering mechanisms during Holocene are conducive to the understanding of the occurrence pattern of extreme climate events. In this paper, the results of the study on the J33 δ18O sequence records of stalagmites in Jinfo Cave, Chongqing, are shown: (1) Stalagmites in the Asian monsoon climate zone reveal a millennial-scale weak monsoon event that occurred around 410 ka BP prior to the Glacial Maximum of MIS 11 interglacial period. (2) Both the 410 ka weak monsoon event and the YD event occurred during the gradual strengthening of the monsoon and ascending branch of summer insolation in the Northern Hemisphere prior to the Glacial Maximum of interglacial period. This was also a time when Atlantic Meridional Overturning Circulation (AMOC) disturbance occurred. The duration, internal structure, and pattern of the events were similar, with differences in the change magnitude and ice volume conditions. (3) The weak monsoon event that occurred in 410 ka BP was primarily influenced by the combined effects of insolation and AMOC. This event was characterized by a sustained warming process that accelerated the melting of the Greenland ice sheet, leading to the destabilization of this ice sheet. The continuous flowing of freshwater into the North Atlantic resulted in a short-lived AMOC oscillation. The weakening of the AMOC resulted in a cold anomaly over the North Atlantic. As a result of atmospheric telecorrelation, the weaker AMOC led to a weaker Asian Summer Monsoon (ASM)
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Key words:
- Asian Summer Monsoon /
- MIS 11c /
- stalagmite δ18O /
- weak monsoon event /
- Jinfo Cave /
- Southwest China
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Figure 3. Comparison of δ18O values of stalagmite J33 in Jinfo Cave and of stalagmite SB14 in Sanbao cave
(A) δ18O record of stalagmite J33 and dating errors (in this study); (B) δ18O record of stalagmite SB14 and dating errors[13]
Figure 4. 410 ka BP weak monsoon event
(A) records of insolation (brown) and inclination (black) at 65 °N on July 21[22]; (B) δ18O record of stalagmite J33 and dating error (in this study); (C) δ18O record of stalagmite SB14 and dating error[14]; (D) record of temperature reconstruction for North Atlantic borehole M23414 0−200 m TEXL 86[23]; (E) record of North Atlantic borehole ODP983% N. pachyderma(s)[24]; (F) Magnetization rate-based record of wind-sand concentration in the central Red Sea[21]; (G) records of Alkenone- and foraminifera-based sea surface temperature (green and light green) from North Atlantic borehole ODP958[25] and records of alkenone-based sea surface temperature (red) from the Mid-Atlantic IODP U1313[26]; (H) ODP980 benthic foraminiferal δ13C record[27]; (I) ODP983 IRD record[22]. Blue bars in the figure indicate weak monsoon events or cold events.
Figure 5. Comparison between the 410 ka weak monsoon event and the YD event (Adapted from Zhang Riping[38])
(A) Stalagmite J33 δ18O record (green, in this study) and insolation record at 65 °N on July 21[22] (black); (B) record of stalagmite H82 δ18O in Hulu cave[39-40] (pink), record of stalagmite D4 δ18O[41] in Dongge cave (blue) and insolation record at 65 °N on July 21[22] (red); (C) NGRIP δ18O record at AICC 2012 dating scale[42] (green) and insolation record at 65 °N on July 21[18] (red). (A) is shown by the time coordinate of upper horizontal axis, and (B) and (C) are shown by the time coordinate of lower horizontal axis. The blue bars in the figure indicate weak monsoon events; the yellow bars indicate strong monsoon events; and the black dotted lines respectively indicate the ending time of the beginning phase and the starting time of the ending phase of the event.
Figure 6. Comparison of selected global records during the 410 ka weak monsoon event and the YD event
(A) records of insolation (brown) and inclination rate (black) at 65 °N on July 21[22]; (B) precession records[22]; (C) record of stalagmite J33 δ18O (turquoise on the left, in this study); δ18O record of stalagmite H82 in Hulu cave[39-40] (pink on the right, ), δ18O record of stalagmite D4 in Dongge cave[41] (dark blue); (D) δ13C record of ODP980 benthic foraminiferal[26] (on the left); 231Pa/230Th ratio of marine sediments[48] (on the right); (E) records of Antarctic ice cores EDC CO2 (gray) and CH4 (blue)[49]; (F) LR04 δ18O record[50] and ODP983 IRD record[24]. The blue bars in Figure six indicate weak monsoon events or cold events.
Table 1. 230Th date results for stalagmite J33 (‘*’ indicates the new measured data.)
Sample
NumberDepth
(mm)238U
(ppb)232Th
(ppt)230Th / 232Th
(atomic×10−6)δ234U
(measured)230Th / 238U
(activity)Age (ka BP)
(uncorrected)Age (ka BP)
(corrected)δ234UInitial
(corrected)J33-1 144.9 2516.4±0.1 884.9±10.2 72003.1±832.5 424.5±0.3 1.536±0.001 393.5±2.0 393.5±2.0 1288.5±7.5 J33-2 185.7 2875.4±0.1 429.4±10.7 167329.4±4184.0 406.4±0.3 1.516±0.001 400.6±1.5 400.6±1.5 1258.9±5.3 J33-3 196.9 2158.7±0.1 2182.9±11.0 24635.3±127.0 402.8±0.3 1.511±0.002 400.9±3.2 400.9±3.2 1248.6±11.2 J33-4 230.9 3113.8±0.2 1397.6±9.8 55814.2±391.3 406.0±0.3 1.519±0.001 409.4±1.6 409.4±1.6 1288.8±5.9 J33-5 268.7 2791.5±0.2 738.7±28.7 95730.9±3715.6 416.4±0.3 1.536±0.001 415.6±1.6 415.6±1.6 1345.7±6.1 J33-6 301.2 2906.0±0.1 479.0±8.4 154689.1±2718.8 422.2±0.3 1.546±0.001 420.5±1.8 420.5±1.8 1383.2±7.1 J33-7* 306.0 3621.9±8.7 672.0±1.6 137821.0±39.0 425.2±0.3 1.551±0.000 421.1±1.3 421.1±1.3 1395.4±5.3 J33-8* 333.0 3173.3±7.7 607.6±1.5 134437.0±38.0 431.6±0.4 1.561±0.000 425.2±1.5 425.2±1.5 1432.7±6.2 U decay constants: λ238 = 1.55125×10−10[13] and λ234 = 2.82206×10−6[9]. Th decay constant: λ230 = 9.1705×10−6[11]. δ234U = ([234U/238U] activity − 1) ×1000. δ234Uinitial was calculated based on 230Th age (T), i.e., δ234Uinitial = δ234Umeasured×eλ234×T. Corrected 230Th ages assume the initial 230Th/232Th atomic ratio of 4.4±2.2×10−6. Those are the values for a material at secular equilibrium, with the bulk earth 232Th/238U value of 3.8. The errors are arbitrarily assumed to be 50%. "BP" stands for "Before Present" where the "Present" is defined as the year 1950 CE. -
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