Abstract
We investigate the effects of the ocean function on predictions of the sea-level changes and other geophysical signals due to glacial rebound. To precisely predict these signals, a realistic ocean function including the effects of the palaeotopography, the distribution of ice sheet and meltwater influx is required. The adoption of a precise ocean function is very important in simulating the observables in Hudson Bay for an earth model with a low lower mantle viscosity of ∼1021 Pa s. In this case, the contribution from water loads can be comparable to that from ice loads. In the Fennoscandian region, however, the predictions are less sensitive to the details of the ocean function, because the width of the Gulf of Bothnia is very small compared with that of Hudson Bay. With an assumption that the ice model is represented by ARC3+ANT4b, we have examined the viscosity structure using relative sea-levels, gravity anomaly and solid surface gravity changes in North America and northern Europe. This study suggests a lower mantle viscosity of greater than 1022 Pa s and a upper mantle viscosity of (4 ∼ 10) × 1020 Pa s.
| Original language | English |
|---|---|
| Pages (from-to) | 1121-1135 |
| Number of pages | 15 |
| Journal | earth, planets and space |
| Volume | 53 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - Jan 1 2001 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Geology
- Space and Planetary Science
Cite this
Effects of water load on geophysical signals due to glacial rebound and implications for mantle viscosity. / Okuno, Jun'ichi; Nakada, Masao.
In: earth, planets and space, Vol. 53, No. 12, 01.01.2001, p. 1121-1135.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of water load on geophysical signals due to glacial rebound and implications for mantle viscosity
AU - Okuno, Jun'ichi
AU - Nakada, Masao
PY - 2001/1/1
Y1 - 2001/1/1
N2 - We investigate the effects of the ocean function on predictions of the sea-level changes and other geophysical signals due to glacial rebound. To precisely predict these signals, a realistic ocean function including the effects of the palaeotopography, the distribution of ice sheet and meltwater influx is required. The adoption of a precise ocean function is very important in simulating the observables in Hudson Bay for an earth model with a low lower mantle viscosity of ∼1021 Pa s. In this case, the contribution from water loads can be comparable to that from ice loads. In the Fennoscandian region, however, the predictions are less sensitive to the details of the ocean function, because the width of the Gulf of Bothnia is very small compared with that of Hudson Bay. With an assumption that the ice model is represented by ARC3+ANT4b, we have examined the viscosity structure using relative sea-levels, gravity anomaly and solid surface gravity changes in North America and northern Europe. This study suggests a lower mantle viscosity of greater than 1022 Pa s and a upper mantle viscosity of (4 ∼ 10) × 1020 Pa s.
AB - We investigate the effects of the ocean function on predictions of the sea-level changes and other geophysical signals due to glacial rebound. To precisely predict these signals, a realistic ocean function including the effects of the palaeotopography, the distribution of ice sheet and meltwater influx is required. The adoption of a precise ocean function is very important in simulating the observables in Hudson Bay for an earth model with a low lower mantle viscosity of ∼1021 Pa s. In this case, the contribution from water loads can be comparable to that from ice loads. In the Fennoscandian region, however, the predictions are less sensitive to the details of the ocean function, because the width of the Gulf of Bothnia is very small compared with that of Hudson Bay. With an assumption that the ice model is represented by ARC3+ANT4b, we have examined the viscosity structure using relative sea-levels, gravity anomaly and solid surface gravity changes in North America and northern Europe. This study suggests a lower mantle viscosity of greater than 1022 Pa s and a upper mantle viscosity of (4 ∼ 10) × 1020 Pa s.
UR - http://www.scopus.com/inward/record.url?scp=0012217122&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0012217122&partnerID=8YFLogxK
U2 - 10.1186/BF03352408
DO - 10.1186/BF03352408
M3 - Article
AN - SCOPUS:0012217122
VL - 53
SP - 1121
EP - 1135
JO - Earth, Planets and Space
JF - Earth, Planets and Space
SN - 1343-8832
IS - 12
ER -