N-15/N-14 304 Naleds 668 NALEDS 105 N-alkanes 48 Nannofossils 203 Napier Complex 91 NASA 53 National interests 600 National parks 146 Natural analogs 89 Natural dams 273 Natural gas 1,262 Natural hazards 402 Natural remanent magnetization 58 Natural resources 1,276 Navigation 1,193 Navigation--Air 98 Navigation - Arctic regions 56 Navigation--Sea 249 Nd-144/Nd-143 169 Near-infrared spectra 84 Nearshore environment 118 Neodymium 189 Neogene 1,311 Neoglacial 903 Neogloboquadrina 157 Neogloboquadrina pachyderma 142 Neon 54 Neoproterozoic 539 Neoptera 262 Neornithes 800 Neotectonics 266 Nesosilicates 384 Networks 112 Neumayer Station 59 Neural networks 142 Neutron scattering 104 New methods 101 New taxa 405 New Zealand--North Island 69 New Zealand--Southern Alps 104 New Zealand--South Island 269 NGRIP 50 Nickel 73 Nitrate ion 299 Nitrates 243 Nitric acid 64 Nitrification 53 Nitrogen 1,201 Nitrogen cycle 85 Nitrogen dioxide 51 Nitrous oxide 186 Nivation 282 NMR spectra 75 NOAA 80 Noble gases 284 Noise 110 Noise (sound) 124 Nomenclature 152 Nomographs 55 North America--Glacier National Park 57 North America--Saint Elias Mountains 64 North America--Saint Lawrence River 72 North America--Yukon River 69 North Atlantic Deep Water 262 North Atlantic Ocean 627 North Atlantic Oscillation 455 Northern Alaska 1,018 Northern Alberta 52 Northern Canada 82 Northern Finland 97 Northern Quebec 57 Northern Sea Route 541 Northern Sweden 160 Northwestern China 66 Northwest passage 66 Northwest Passage 54 Norway--Northern Norway 115 Norway--Southern Norway 112 Norway--Spitsbergen 762 Norway--Svalbard 363 Nototheniidae 108 Notothenioidei 52 NSF 66 Nuclear explosions 72 Nuclear magnetic resonance 132 Nuclear power 183 Nucleating agents 324 NUCLEATING AGENTS 146 Nucleation 223 NUCLEATION 82 Nucleation rate 115 Nuclei (Ice crystal) - Formation 59 Numerical analysis 506 Numerical models 3,931 Nunataks 151 Nutrient cycle 1,209 Nutrients 1,526 Nutrition 261 Ny Alesund 136