| 释义 |
Definition of permafrost in English: permafrostnoun ˈpəːməfrɒstˈpərməˌfrɔst mass nounA thick subsurface layer of soil that remains below freezing point throughout the year, occurring chiefly in polar regions. hilly terrain underlain by permafrost Example sentencesExamples - These self-organized patterns result from the effects of freezing and thawing on layers of stone and soil overlying permafrost.
- Increased snow and ice melt have caused higher rivers while thawing permafrost has wreaked havoc with roads and other infrastructure.
- In regions influenced by permafrost, water migrates along the thermal gradient from warm to cold, thereby feeding ice in the frozen core.
- It's estimated that a quarter to a third of all soil carbon is locked in permafrost.
- The rest of the year what little soil there is on the surface is rock hard above permafrost.
- We are already beginning to see the likely effects of climate change: melting permafrost and the retreat of permanent icepacks.
- The forest grows atop permafrost, a layer of soil that remains frozen year-round.
- However, permafrost covered large northern areas and many habitats were fragmented and displaced southward.
- A species of bacterium locked in Alaskan permafrost for 32,000 years woke up and started swimming as soon as its medium melted.
- Hot, dry summers have thawed permafrost layers and shriveled berry crops.
- Most of the remainder comes from wetlands, gas hydrates, permafrost, and termites.
- These climates introduced permafrost and cold-climate weathering products to river systems.
- On Alaska's northern coast, they met Native Alaskans dealing with melting permafrost and coastal erosion.
- However, there may be water locked in permafrost in some deep polar craters.
- But most of it is under tundra permafrost, if not indeed under even more inhospitable terrain.
- In the north soil takes the form of permafrost, where the water in the ground is permanently frozen.
- It's springtime in Siberia, where slumbering mammoths are emerging from melting permafrost.
- In some areas, thawing of permafrost will improve infiltration.
- The permafrost below the topsoil is frozen all year around, and this prevents roots from penetrating deeply into the ground.
- In many high mountains regions, permafrost may be present.
Origin 1940s: from permanent + frost. Definition of permafrost in US English: permafrostnounˈpərməˌfrɔstˈpərməˌfrôst A thick subsurface layer of soil that remains frozen throughout the year, occurring chiefly in polar regions. hilly terrain underlain by permafrost Example sentencesExamples - However, there may be water locked in permafrost in some deep polar craters.
- However, permafrost covered large northern areas and many habitats were fragmented and displaced southward.
- A species of bacterium locked in Alaskan permafrost for 32,000 years woke up and started swimming as soon as its medium melted.
- In the north soil takes the form of permafrost, where the water in the ground is permanently frozen.
- We are already beginning to see the likely effects of climate change: melting permafrost and the retreat of permanent icepacks.
- Most of the remainder comes from wetlands, gas hydrates, permafrost, and termites.
- On Alaska's northern coast, they met Native Alaskans dealing with melting permafrost and coastal erosion.
- In some areas, thawing of permafrost will improve infiltration.
- In regions influenced by permafrost, water migrates along the thermal gradient from warm to cold, thereby feeding ice in the frozen core.
- The permafrost below the topsoil is frozen all year around, and this prevents roots from penetrating deeply into the ground.
- The forest grows atop permafrost, a layer of soil that remains frozen year-round.
- The rest of the year what little soil there is on the surface is rock hard above permafrost.
- These climates introduced permafrost and cold-climate weathering products to river systems.
- It's estimated that a quarter to a third of all soil carbon is locked in permafrost.
- These self-organized patterns result from the effects of freezing and thawing on layers of stone and soil overlying permafrost.
- It's springtime in Siberia, where slumbering mammoths are emerging from melting permafrost.
- Increased snow and ice melt have caused higher rivers while thawing permafrost has wreaked havoc with roads and other infrastructure.
- Hot, dry summers have thawed permafrost layers and shriveled berry crops.
- But most of it is under tundra permafrost, if not indeed under even more inhospitable terrain.
- In many high mountains regions, permafrost may be present.
Origin 1940s: from permanent + frost. |